Zwo Seestar S50 Review

The ZWO Seestar S50 is, without a doubt, a must for anyone looking to dip their toes into astrophotography without the steep learning curve or prohibitive cost typically associated with the hobby.

This compact, all-in-one smart telescope integrates a camera, mount, and control system into a single, user-friendly device, making deep-sky imaging accessible to beginners while offering surprising capabilities for seasoned enthusiasts.

It’s essentially an entry point that delivers genuine results, allowing users to capture stunning images of galaxies, nebulae, and star clusters with minimal setup and maximum automation.

If you’ve been curious about capturing the cosmos but felt intimidated by complex setups, the Seestar S50 offers a streamlined path to celestial photography.

Product Name	Primary Function	Key Feature	Price Range USD	Ideal User
ZWO Seestar S50	Smart Telescope	All-in-one automated astrophotography	$499 – $599	Beginners, casual astronomers, travelers
Celestron StarSense Explorer LT 114AZ	Manual Reflector Telescope	Smartphone app for assisted alignment	$200 – $300	Visual observers, budget-conscious beginners
Sky-Watcher Virtuoso GTi 150P	Computerized Dobsonian Telescope	GoTo capabilities, portable	$600 – $800	Visual observers, deep-sky enthusiasts
Orion StarBlast II 4.5 EQ Reflector Telescope	Equatorial Reflector Telescope	Manual tracking, good for lunar/planetary	$250 – $350	Manual enthusiasts, educational use
Astrophotography Cameras	Dedicated Imaging Device	High sensitivity, low noise sensors	Varies widely $300 – $3000+	Serious astrophotographers
Portable Power Stations	Power Supply	Essential for field operation of telescopes	$100 – $1000+	All outdoor astronomy users
Telescope Mounts	Equatorial/Alt-Az Mount	Stable tracking, supports various telescopes	$300 – $5000+	Astrophotographers, visual observers

The Seestar S50: A New Paradigm for Astrophotography

The ZWO Seestar S50 isn’t just another telescope.

It’s a paradigm shift for how many people will engage with astrophotography.

Traditionally, getting into deep-sky imaging has meant a significant investment in separate components—a telescope, an equatorial mount, a dedicated astrophotography camera, a guide scope, various cables, and often a laptop for control.

This complexity not only drives up costs but also introduces a steep learning curve that discourages many potential enthusiasts.

The Seestar S50 changes this by integrating all these functions into a single, smart device controlled entirely via a smartphone app. Dt Research Dt302Rp Rugged Tablet Review

It’s designed to be plug-and-play, allowing even complete novices to capture impressive images of celestial objects within minutes of unpacking.

All-in-One Design and Portability

One of the most compelling aspects of the Seestar S50 is its integrated, all-in-one design.

This isn’t a collection of separate pieces you need to assemble and balance.

Instead, it’s a compact unit that houses the optical tube, the mount, and the camera sensor.

This integration leads directly to its exceptional portability. Hisense 75U7N Review

• Compact Form Factor: The Seestar S50 is roughly the size of a large water bottle or a small lunchbox, making it incredibly easy to transport. This means you can take it camping, on road trips, or simply to a darker location away from city lights without needing a dedicated vehicle or a cumbersome setup.
• Lightweight Construction: Weighing in at just under 6 lbs around 2.5 kg, it’s light enough to be carried by hand for extended periods, further enhancing its grab-and-go appeal.
• Minimal Setup Time: Because everything is integrated, setup time is drastically reduced. You simply unfold the tripod, place the Seestar on it, and power it on. There are no separate components to balance or align manually, which is a massive time-saver compared to traditional astrophotography rigs that can take 30 minutes to an hour or more to set up.

Automated Setup and GoTo Functionality

The Seestar S50’s automation is arguably its most significant selling point for beginners.

It takes the guesswork out of finding and tracking celestial objects, a process that can be frustrating for newcomers using manual telescopes or even entry-level GoTo systems that require precise alignment.

• Automatic Star Alignment: Upon power-up, the Seestar S50 performs an internal star alignment using its built-in camera and plate-solving technology. This means it takes a wide-field image of the sky, identifies the stars in that image, and then calculates its precise orientation. This process is fully automated and typically takes less than a minute. You don’t need to manually point at bright stars or input coordinates.
• Effortless GoTo Tracking: Once aligned, you simply select an object from the Seestar app’s extensive catalog galaxies, nebulae, star clusters, planets, the Moon, Sun and the telescope automatically slews to it and begins tracking. This eliminates the need for finding charts, red-dot finders, or complex star-hopping techniques.
• Accurate Tracking for Long Exposures: The integrated mount is designed for precision tracking, crucial for astrophotography where even tiny errors can lead to star trails in long exposures. While it’s not a professional-grade equatorial mount, it’s remarkably effective for its price point and intended use, allowing for exposures that wouldn’t be possible with simpler alt-azimuth mounts.

Imaging Capabilities and Image Quality

Despite its compact size and beginner-friendly nature, the Seestar S50 is capable of producing surprisingly good astrophotography images, especially for deep-sky objects.

It’s designed for long-exposure stacking, a technique common in astrophotography to reveal faint details.

• Sensor and Optics: It features an IMX462 sensor, which is known for its high sensitivity and low noise, particularly in low-light conditions. The optical tube is a 50mm aperture apochromatic triplet refractor, which means it uses three lens elements to minimize chromatic aberration color fringing, resulting in sharper, more color-accurate images. The focal length is 250mm, providing a relatively wide field of view, ideal for capturing larger nebulae and galaxies.
• Automated Image Stacking: The Seestar S50 automatically takes multiple short exposures e.g., 10 seconds each and stacks them internally to create a single, longer effective exposure. This process reduces noise and enhances faint details that wouldn’t be visible in a single frame. The app then performs basic image processing, including dark frame subtraction and stretching, to produce a viewable image.
• Live Stacking Feature: A standout feature is the “live stacking” mode. As the Seestar captures more exposures, the stacked image on your phone screen progressively improves, revealing more detail and color in real-time. This is incredibly rewarding for beginners, as it provides immediate feedback and shows the power of image stacking.
• Limitations: While impressive, it’s important to manage expectations. The 50mm aperture means it gathers less light than larger telescopes, so faint objects will require longer total exposure times to show significant detail. It’s also not optimized for high-resolution planetary imaging, though it can capture decent images of the Moon and brighter planets like Jupiter and Saturn.

User Experience and Software

The entire Seestar S50 experience revolves around its intuitive smartphone application. Asus Rog Strix Scope Ii 96 Wireless Review

This app is the control center for everything, from initial setup to image capture and sharing.

ZWO has clearly invested heavily in making this software as user-friendly as possible, mimicking the simplicity of a point-and-shoot camera while hiding the complex astrophotography processes in the background.

The Seestar App: Your Command Center

The dedicated Seestar app available for both iOS and Android is the sole interface for controlling the telescope.

There are no physical buttons on the unit itself beyond the power button.

This approach streamlines the user experience and consolidates all functionalities into one place. Lenovo Legion Pro 7I Gen 9 16 Review

• Intuitive Layout: The app’s interface is clean and well-organized, making it easy for first-time users to navigate. Key functions like “Explore,” “Observe,” “Capture,” and “Plan” are readily accessible.
• Object Database: The “Explore” section provides a comprehensive database of celestial objects, categorized by type DSO, planets, moon, sun, constellations and visibility based on your location and time. Each object includes basic information, stunning reference images, and optimal viewing periods. This is a fantastic educational tool.
• Planning Mode: The “Plan” feature allows users to schedule observations, showing when specific objects will be visible and optimally positioned in the sky. This is especially useful for targeting objects that are only visible at certain times of night or year.
• Real-time Feedback: During observations, the app provides real-time feedback on the telescope’s status, including battery life, temperature, and progress of image capture and stacking.

Photography Modes and Settings

The app offers various modes tailored to different astronomical targets and user preferences, simplifying the complex world of camera settings.

• Deep Sky Object DSO Mode: This is the primary mode for nebulae and galaxies. Users can set the desired total exposure time e.g., 30 minutes, 1 hour and the app automatically handles the individual sub-exposure lengths and stacking process. The live stacking feature in this mode is truly captivating.
• Planetary Mode: Optimized for brighter objects like Jupiter, Saturn, and Mars, this mode captures high-frame-rate video that can then be processed usually off-device to extract sharp planetary details.
• Lunar Mode: Similar to planetary mode but tailored for the Moon, allowing for detailed captures of its surface.
• Solar Mode: Crucially, this mode requires the proper solar filter often included or sold separately to be attached to the Seestar. Without the filter, pointing at the Sun will cause immediate and irreparable damage to the sensor. The app will usually prompt or enforce a check for the filter. This mode allows for capturing sunspots and solar features.
• Manual Mode Limited: While primarily automated, there are some limited manual controls for advanced users, such as adjusting gain and exposure time for individual frames, although the magic happens with the automated stacking.

Post-Processing and Sharing

The Seestar S50 aims to provide a ready-to-share image directly from the device, though it also offers options for more advanced users.

• In-App Processing: The app performs basic stretching, noise reduction, and color balancing on the stacked images. This means you get a presentable image directly on your phone, ready for social media or sharing with friends.
• FITS File Export: For those who want to take their images further, the Seestar can save the raw, unstacked individual frames as FITS files. These files can then be transferred to a computer for advanced processing using specialized astrophotography software like PixInsight, Siril, or DeepSkyStacker, allowing for maximum detail extraction and artistic control.
• Image Gallery and Sharing: The app includes a built-in gallery to review your captures and facilitates easy sharing to social media platforms or cloud storage.

Performance and Limitations

While the Seestar S50 excels in accessibility and ease of use, it’s important to understand its performance characteristics and inherent limitations, especially when compared to more advanced astrophotography setups.

Managing expectations is key to enjoying this device.

Deep Sky Performance

The Seestar S50 shines when it comes to capturing deep-sky objects DSOs, particularly larger and brighter nebulae and galaxies. Empower Review

Its wide field of view is a distinct advantage here.

• Nebulae: Emission nebulae like the Orion Nebula M42, Lagoon Nebula M8, and the Crescent Nebula NGC 6888 show up beautifully. The Seestar’s automated stacking allows for the subtle reds and blues of these gas clouds to emerge. Reflection nebulae, such as the Pleiades M45, also photograph well.
• Galaxies: Brighter galaxies like the Andromeda Galaxy M31, Triangulum Galaxy M33, and Bode’s Galaxy M81 are well within its capabilities. You can clearly resolve their spiral arms and galactic cores, especially with longer total integration times.
• Star Clusters: Open clusters like the Double Cluster NGC 869/884 and globular clusters such as M13 Hercules Globular Cluster are rendered with sharp, pinpoint stars, a testament to the apochromatic optics.
• Detail vs. Light Gathering: The main limitation for DSOs is its 50mm aperture. While it can capture stunning images for its size, it won’t resolve the intricate, fine details in very faint, distant galaxies that a larger e.g., 8-inch telescope might. Light gathering power is proportional to the square of the aperture, so a 200mm scope gathers 16 times more light than a 50mm one. This means you’ll need longer total exposure times with the Seestar to achieve comparable signal-to-noise ratios on very faint objects.

Planetary and Lunar Performance

While primarily designed for deep-sky imaging, the Seestar S50 can capture decent images of the Moon and brighter planets.

• Lunar Imaging: The Moon is an excellent target for the Seestar. Its brightness ensures quick capture times, and the 250mm focal length provides a good field of view for capturing large sections of the lunar surface, revealing craters and maria.
• Planetary Imaging: For planets like Jupiter, Saturn, and Mars, the Seestar’s 250mm focal length is relatively short for high-resolution planetary imaging, which typically requires much longer focal lengths e.g., 2000mm+. You can capture recognizable images of these planets showing major features e.g., Jupiter’s bands, Saturn’s rings, but don’t expect the level of detail seen from dedicated planetary setups with Barlow lenses and larger telescopes. The smaller sensor pixels also mean that even without a Barlow, you’re already reaching theoretical resolution limits for planetary disc size.
• Solar Imaging: With the appropriate solar filter, the Seestar performs well for capturing sunspots and the granulated surface of the Sun. This is a very accessible way to observe and image our closest star safely.

Battery Life and Power Management

The Seestar S50 comes with a built-in battery, enhancing its portability.

• Battery Duration: The internal battery typically provides 5-6 hours of continuous operation, which is sufficient for many casual observing or imaging sessions.
• External Power Options: For longer sessions, the Seestar S50 can be powered and charged via a USB-C port, allowing it to be connected to a portable power bank. This significantly extends its operational time, making it suitable for all-night imaging runs.
• Temperature Impact: As with most electronic devices, cold temperatures can reduce battery performance. Keeping a portable power bank handy is a good strategy for winter nights.

Durability and Build Quality

The Seestar S50 is built with a sturdy, all-metal construction for its main body, giving it a premium feel.

• Robust Housing: The optical tube and mount components are housed within a durable casing that feels solid and well-made.
• Tripod: The included mini-tripod is compact and functional for tabletop use or stable surfaces, but for serious imaging, particularly in breezy conditions, a more robust and taller photography tripod with a standard 1/4″-20 screw mount is highly recommended. The Seestar has a standard tripod thread, making it compatible with most camera tripods.
• Weather Resistance: While it’s generally well-sealed, it’s not designed to be weatherproof. Avoid exposing it to rain or heavy dew, as electronic components can be damaged.

Accessories and Ecosystem

While the ZWO Seestar S50 is an all-in-one unit, ZWO and third-party manufacturers offer a growing ecosystem of accessories that can enhance its capabilities and user experience. Yaber K2S Review

Understanding these options can help you maximize your investment.

Essential and Recommended Accessories

Some accessories are practically essential for getting the most out of your Seestar S50, while others are highly recommended for specific use cases.

• Solar Filter: This is not just an accessory. it’s a safety imperative if you plan to observe or image the Sun. Most Seestar packages include a dedicated solar filter that fits securely over the aperture. Never point the Seestar at the Sun without this filter installed, as it will cause instant and irreversible damage to the internal camera sensor.
• Portable Power Bank: While the Seestar has an internal battery, a high-capacity portable power station with a USB-C output preferably PD compatible for faster charging is highly recommended. This allows for all-night imaging sessions or charging in the field without access to an AC outlet. Look for power banks with at least 20,000 mAh capacity.
• Taller, Sturdier Tripod: The included mini-tripod is fine for initial testing or tabletop use. However, for serious astrophotography, especially with wind or uneven terrain, a full-size, sturdy telescope tripod with a standard 1/4″-20 camera screw mount is a must-have. This will minimize vibrations, provide better stability, and allow you to point the telescope at higher altitudes without strain.
• Dew Heater Strip: On humid nights, condensation dew can form on the objective lens, blurring or completely obscuring your images. A dew heater strip specifically sized for the Seestar’s 50mm aperture, powered by a small USB power bank, can prevent this.
• Carrying Case: While it often comes with a soft case, a hard-shell, padded camera bag or a dedicated Seestar case provides better protection during transport, especially if you plan to travel frequently with it.

Future Potential and Software Updates

ZWO has a strong track record of supporting its products with ongoing software and firmware updates, and the Seestar S50 is no exception.

This commitment means the device’s capabilities can evolve over time. Canon Color Imageclass Lbp674Cdw Review

• Firmware Updates: ZWO regularly releases firmware updates that can improve tracking accuracy, optimize power consumption, enhance image processing algorithms, and even introduce new features. These are typically installed easily via the Seestar app.
• App Updates: The mobile app also receives frequent updates, bringing new features, bug fixes, and usability improvements. ZWO often adds new objects to the database, improves the GoTo system, and refines the live stacking experience.
• Community Feedback: ZWO is known for listening to its user community. Many feature requests and improvements originate from user forums and feedback, indicating a responsive development cycle. This continuous improvement adds significant long-term value to the product.

Comparison to Traditional Setups

The Seestar S50 fills a unique niche by offering a complete solution at a price point and ease of use that traditional setups simply cannot match.

Feature	ZWO Seestar S50	Traditional Entry-Level Astrophotography Setup
Cost	~$500-$600 all-in	~$1000 – $2000+ scope, mount, camera, guide scope, etc.
Setup Time	5-10 minutes	30-60+ minutes
Complexity	Extremely low, app-controlled	High, multiple components, cables, software
Portability	Excellent, backpackable	Moderate to low, often requires multiple trips
Learning Curve	Very low, automated	High, requires understanding alignment, tracking, processing
Image Quality DSO	Good for wide-field, accessible detail	Excellent, more detail with larger aperture/longer focal length
Image Quality Planetary	Basic, limited resolution	Excellent, high resolution possible
Skill Level	Beginner to intermediate	Intermediate to advanced
Upgrade Path	Software updates, external power/tripod	Modular, components can be upgraded individually

This table highlights that while a traditional setup offers greater flexibility and ultimate image quality potential, the Seestar S50 wins hands down on initial cost, ease of use, and portability, making it the ideal choice for those who want to jump straight into astrophotography without the overwhelming initial hurdles.

Who is the Seestar S50 For?

The ZWO Seestar S50 isn’t a one-size-fits-all solution, but it carves out a very specific and underserved niche in the astronomy market.

Understanding its target audience is crucial to appreciating its value.

This smart telescope is designed for accessibility, convenience, and a streamlined experience rather than ultimate professional-grade performance. Apple Pencil Pro Review

Ideal for Beginners in Astrophotography

This is, without a doubt, the primary audience for the Seestar S50. Many individuals are fascinated by celestial objects and dream of capturing their beauty but are intimidated by the complexity and cost of traditional astrophotography.

• No Prior Experience Required: The Seestar S50 removes virtually all the technical barriers. You don’t need to understand equatorial alignment, polar alignment routines, guiding, or complex camera settings. The app handles it all.
• Immediate Gratification: The live stacking feature provides instant visual feedback, showing the image developing in real-time. This is incredibly motivating for new users who might otherwise get discouraged by hours of setup and processing before seeing any results.
• Affordable Entry Point: Compared to purchasing a separate telescope, an equatorial mount, and a dedicated astrophotography camera, the Seestar S50’s all-in-one price point is remarkably competitive, making it a much more accessible investment for a hobby that can quickly become very expensive.
• Educational Tool: It’s also an excellent tool for learning about the night sky, finding objects, and understanding the basics of deep-sky imaging without getting bogged down in the technical minutiae.

Perfect for Casual Observers and Travelers

Beyond dedicated astrophotographers, the Seestar S50 appeals strongly to those who enjoy general astronomy but prioritize convenience and portability.

• Grab-and-Go Convenience: Its compact size and quick setup make it ideal for spontaneous stargazing trips, camping excursions, or even just setting up in your backyard on a clear night. You don’t need to dedicate a significant portion of your vehicle space or setup time to bring it along.
• Light Pollution Mitigation: While no telescope can fully eliminate light pollution, the Seestar’s deep-sky imaging capabilities, combined with image stacking, allow it to punch through moderate light pollution better than visual observation alone. This means urban dwellers can still get satisfying results.
• Social Sharing: The ease of capturing and sharing images directly from the app makes it a fantastic tool for sharing your cosmic discoveries with friends and family, either in person or via social media.

A Companion for Experienced Astronomers

Even seasoned astrophotographers or visual observers might find a place for the Seestar S50 in their arsenal.

• Scouting Tool: Experienced imagers can use the Seestar as a quick scout for potential targets or to assess sky conditions at a new dark-sky site before deploying their much larger and more complex main rig.
• Educational Demonstrations: It’s an excellent tool for public outreach events or teaching beginners, as it provides immediate, tangible results without overwhelming participants with technical jargon.
• Quick Visuals: For nights when you don’t want to drag out all your heavy gear but still want to grab a quick image of a nebula or galaxy, the Seestar is perfect.

Not for Everyone: Who Might Find it Limiting?

While versatile, the Seestar S50 does have limitations that make it less suitable for certain users:

• High-Resolution Planetary Imagers: If your primary goal is to capture ultra-detailed, high-resolution images of Jupiter, Saturn, or Mars, the Seestar’s shorter focal length and smaller aperture will be a significant bottleneck. Dedicated planetary cameras and larger, longer focal length telescopes are necessary for this.
• Serious Visual Observers: While it can capture images, the Seestar S50 is not a visual telescope. There is no eyepiece to look through. All viewing is done via the app on your smartphone or tablet. If you prefer the direct, immersive experience of looking through an eyepiece, this is not the right choice.
• Advanced Astrophotographers Seeking Maximum Customization: While the Seestar is convenient, it offers limited manual control over camera settings gain, exposure, filters. If you’re an advanced user who wants granular control over every aspect of the imaging train, uses specialized narrowband filters, or requires extremely precise guiding for very long exposures, you’ll find the Seestar too restrictive. It’s an appliance, not a toolkit.
• Those Seeking Deepest Faint Objects: Due to its 50mm aperture, the Seestar S50 has inherent limitations in light-gathering power. While it can produce good images of many DSOs, it won’t resolve the very faint, distant galaxies or the most subtle details in expansive, dim nebulae that a much larger telescope e.g., 8-inch or 10-inch aperture can.

In essence, the Seestar S50 prioritizes ease of use and accessibility. Livexlive Powered By Slacker Review

If those are your top priorities, and you’re comfortable with its optical limitations, it’s an outstanding investment that will deliver rewarding results.

Setting Up and First Light Experience

The ZWO Seestar S50 is designed for a near plug-and-play experience, a refreshing change from the often-complex setup procedures of traditional astrophotography equipment.

Getting started is remarkably straightforward, typically taking only a few minutes from unpacking to capturing your first image.

Unboxing and Initial Assembly

The unboxing experience is usually quite simple.

The Seestar S50 typically comes with the main unit, a compact tabletop tripod, a solar filter, and a USB-C cable for charging. Edifier Qr65 Review

1. Charge the Device: Before anything else, fully charge the Seestar S50 using the provided USB-C cable. A full charge can take a few hours.
2. Download the App: While charging, download the official ZWO Seestar app from your smartphone’s app store iOS or Android. This app is essential for controlling the telescope.
3. Attach to Tripod: Once charged, unfold the included mini-tripod and screw the Seestar S50 onto its standard 1/4″-20 threaded mount. Ensure it’s securely fastened. If using a larger, sturdier tripod, attach it similarly.
4. Power On: Press and hold the power button on the Seestar until the indicator light illuminates.

Connecting to the App

Connecting your smartphone to the Seestar S50 is done via Wi-Fi, as the Seestar acts as its own Wi-Fi hotspot.

1. Enable Wi-Fi on Phone: Go to your phone’s Wi-Fi settings.
2. Select Seestar Network: You should see a Wi-Fi network named “Seestar_XXXXXX” where XXXXXX is a unique identifier. Select this network.
3. Open Seestar App: Launch the Seestar app. It should automatically detect and connect to the device.
4. Firmware Update if prompted: The app may prompt you to perform a firmware update for the Seestar unit. It’s highly recommended to do this immediately, as updates often include crucial bug fixes and performance improvements. Ensure you have a stable internet connection for your phone during this step.

First Light: Pointing to the Sky

With the app connected and the Seestar on its tripod, you’re ready for your first celestial capture.

1. Place on Level Surface: Place the Seestar on a level, stable surface outdoors with a clear view of the sky. For best results, avoid setting it directly on hot pavement or surfaces that might vibrate.
2. App Interface – “Explore” Tab: In the Seestar app, navigate to the “Explore” tab. Here, you’ll see a map of the current night sky based on your location and time, along with a list of visible deep-sky objects, planets, and constellations.
3. Select a Target: Choose an object from the list. For a first light, a bright, easy-to-find object like the Orion Nebula M42 in winter/spring or the Lagoon Nebula M8 in summer/fall is ideal. The app will indicate if the object is currently visible and well-positioned.
4. Initiate GoTo: Tap on your chosen object and then select “Go.” The Seestar will begin its automated process:
   • Self-calibration: It will first perform an internal check.
   • Plate Solving & Alignment: It will take a few wide-field images, use its internal plate-solving algorithm to identify the stars, and precisely determine its orientation in space. This usually takes under a minute.
   • Slewing: The telescope will then automatically slew move to center the chosen object in its field of view.
   • Tracking: Once centered, it will begin tracking the object as it moves across the sky due to Earth’s rotation.
5. Start Capturing: After centering and tracking, the app will transition to the “Capture” screen. Select “Deep Sky” mode for nebulae/galaxies. You can set a total integration time e.g., 30 minutes, 1 hour. The Seestar will then begin taking individual exposures and stacking them in real-time.
6. Witness Live Stacking: As more sub-exposures are captured and added to the stack, you’ll see the image on your phone screen progressively improve, revealing more detail, color, and reducing noise. This “live stacking” is often the most magical part of the Seestar experience for newcomers.
7. Save Your Image: Once you’re satisfied with the image or the total integration time is complete, stop the capture. The final stacked image will be saved to your Seestar’s internal storage and can be viewed/downloaded via the app’s “Album” section.

Troubleshooting Common First Light Issues

While generally smooth, a few common issues might arise during your first Seestar session:

• “No Seestar Device Found”:
  • Solution: Double-check that your phone is connected to the Seestar’s Wi-Fi network. Ensure the Seestar is powered on and fully charged.
• Poor Tracking/Star Trails:
  • Solution: Ensure the Seestar is on a very stable surface. Strong winds can cause vibrations. If using the small included tripod, try placing it on a sturdy table or switch to a heavier, more stable camera tripod.
• Object Not Centered After GoTo:
  • Solution: This is rare with the Seestar’s plate solving. If it happens, ensure the device is on a level surface. Sometimes, minor adjustments to the tripod position or re-initiating the GoTo process can help. Ensure no obstructions trees, buildings are blocking the view in the direction of the target.
• “Focus Failed”:
  • Solution: The Seestar uses auto-focus. If it fails, try manually helping it by tapping on the screen where you see stars in the live view, or try pointing at a bright star to help it find focus before moving to a dimmer DSO. Extreme temperature changes can sometimes affect initial focus.
• Heavy Dew on Lens:
  • Solution: If the objective lens fogs up, the images will be blurry or washed out. This is where a dew heater strip becomes invaluable. If you don’t have one, you’ll need to carefully wipe the lens with a clean micro-fiber cloth, but it will likely re-fog.

By following these steps and being aware of common pitfalls, your first light experience with the Seestar S50 should be a rewarding and exciting introduction to automated astrophotography.

Advanced Techniques and Maximizing Seestar S50 Output

While the ZWO Seestar S50 excels at automation and simplicity, there are several advanced techniques and considerations that can help you squeeze even more performance and quality out of your captures. Simplifi By Quicken Review

These go beyond the basic point-and-shoot operation and leverage features often overlooked by beginners.

Utilizing FITS Files for External Processing

The Seestar app does a decent job of stacking and processing images internally, providing a ready-to-share JPEG or TIFF.

However, for maximum image quality and artistic control, the real power lies in utilizing the raw FITS files it captures.

• Understanding FITS Files: FITS Flexible Image Transport System is the standard file format in astronomy for raw scientific data. Each FITS file captured by the Seestar is a single, un-stretched, un-processed sub-exposure.

• Exporting FITS: In the Seestar app’s “Album” section, you can select a completed imaging session and choose to export the individual FITS files. These will typically be saved to your phone’s internal storage or a connected computer. Malwarebytes Free Review

• External Stacking Software:

  • DeepSkyStacker DSS: A free and popular software for Windows that stacks FITS files to create a single, high-signal image. It’s relatively easy to use for beginners in external processing.
  • Siril: A free, open-source software for Windows, macOS, and Linux that offers more advanced stacking, calibration dark/flat/bias frames, and processing capabilities.
  • PixInsight: A professional-grade, paid software suite for astrophotography processing. It has a steep learning curve but offers unparalleled control and results.

• The Workflow:

  1. Capture a long session with the Seestar e.g., 2+ hours on a target.

  2. Export the FITS files.

  3. Transfer FITS files to a computer. Harold Halibut Review

  4. Use DSS, Siril, or PixInsight to stack all the individual FITS frames.

This combines the signal from hundreds or thousands of sub-exposures, dramatically improving the signal-to-noise ratio.

5.  Perform advanced post-processing stretching, noise reduction, color calibration, star reduction, sharpening using the stacking software or external image editors like Adobe Photoshop or GIMP with astro plugins.

• Benefits: External processing allows for:
  • Superior Noise Reduction: More sophisticated algorithms can be applied.
  • Deeper Details: Faint nebulosity and galactic arms become more apparent.
  • Accurate Color Calibration: Correcting for light pollution gradients and achieving true astronomical colors.
  • Artistic Control: Full control over the final look of your image.

Dark Frames and Calibration Beyond Seestar’s Automation

While the Seestar automatically performs some internal calibration likely dark frame subtraction, taking your own dark frames can further improve image quality, especially if you plan to process FITS files externally.

• What are Dark Frames? Dark frames are exposures taken with the same exposure time, ISO/gain, and sensor temperature as your light frames the images of your target, but with the lens cap on. They capture the “noise” generated by the camera sensor itself thermal noise, hot pixels without any light signal.
• Why Use Them? Subtracting dark frames from your light frames during stacking helps remove this fixed pattern noise and random thermal noise, resulting in cleaner images.
• How to Capture: With the Seestar, put the lens cap on firmly. Set the camera to “Dark” mode in the app if available, check updated Seestar firmware or simply take regular exposures with the cap on at the same exposure time and gain settings you used for your celestial target. Take at least 20-30 dark frames.
• Integration: These dark frames are then applied during the stacking process in external software like DSS or Siril.

Optimal Total Integration Time

The Seestar S50 automates sub-exposure length, but you control the total integration time. This is critical for deep-sky imaging.

• The More, The Better: Generally, the longer the total integration time, the better the final image. Each additional hour of data contributes to a higher signal-to-noise ratio, revealing fainter details and reducing noise.
• Practical Limits: While theoretically, you could integrate for days, practical limits include:
  • Battery Life: Use a portable power station for extended sessions.
  • Target Visibility: Objects rise and set. Use the app’s planning tool to maximize time on target.
  • Sky Conditions: Avoid imaging through clouds or significant light pollution.
  • Data Storage: Ensure your phone or computer has enough space for the large FITS files.
• Recommendations: For challenging DSOs, aim for a minimum of 1-2 hours of total integration time. For brighter nebulae, 30 minutes to an hour can yield great results. For truly stunning, magazine-quality images with the Seestar, some users will stack 5-10+ hours of data on a single target.

Using a Sturdier Tripod and Leveling

While the Seestar’s automation is powerful, a stable and level platform enhances its performance, particularly for tracking and GoTo accuracy.

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• Benefits of a Sturdier Tripod: A heavier, more rigid tripod e.g., a good quality photographic tripod will:
  • Reduce Vibrations: Less shake from wind or accidental bumps means sharper stars.
  • Improve Tracking: A stable base allows the mount to track more precisely.
  • Better GoTo Accuracy: Less flex in the system means the Seestar can point to targets more accurately.
• Leveling: While the Seestar doesn’t require precise polar alignment like an equatorial mount, getting it as level as possible using a bubble level on the tripod or the Seestar itself can improve its GoTo accuracy and internal calibration routines. This minimizes strain on the internal motors.

Location, Location, Location and Dark Skies

No amount of technology can fully compensate for poor observing conditions.

• Dark Skies: The single biggest factor for deep-sky astrophotography is moving away from light pollution. Even a small improvement in sky darkness makes a monumental difference in the faintness of objects you can capture and the quality of your images. Use a dark-sky map to find good locations.
• Clear Skies: Obvious, but essential. Check weather forecasts and satellite images for clear, cloudless nights.
• Seeing Conditions: “Seeing” refers to the steadiness of the atmosphere. Turbulent air e.g., strong jet stream, heat rising from pavement causes stars to “twinkle” and will limit the sharpness of your images. There’s little you can do about this except to check seeing forecasts e.g., meteoblue.com and pick nights with good seeing, especially if you’re trying to push the Seestar’s resolution limits.
• Dew Prevention: As mentioned, a dew heater strip is crucial in humid conditions to prevent the objective lens from fogging up.

By implementing these advanced techniques, Seestar S50 users can transcend the basic point-and-shoot experience and truly unlock the device’s potential, producing images that belie its small size and cost.

Maintenance and Care for Your Seestar S50

To ensure your ZWO Seestar S50 continues to perform optimally and provides years of celestial enjoyment, proper maintenance and care are essential.

While it’s a robust device, like any optical and electronic instrument, it benefits from attention to detail. Dreo Macro Max S Air Purifier Review

Cleaning the Optics

The most critical part of maintaining image quality is keeping the objective lens clean.

Dust, fingerprints, and dew residue can degrade image clarity.

• Frequency: Clean only when necessary. Excessive cleaning can do more harm than good.
• Initial Dust Removal: Start by using a blower brush or a can of compressed air used carefully, from a distance, never inverted to gently blow off any loose dust or debris from the lens surface. Avoid wiping at this stage, as dust particles can scratch the coating.
• Fingerprints/Smudges: If there are smudges or fingerprints, use a specialized optical cleaning solution like those for camera lenses and a clean, soft microfiber lens cloth. Apply a small amount of solution to the cloth never directly to the lens and gently wipe in a circular motion from the center outwards.
• Dew Stains: If dew dries on the lens, it can leave mineral residue. This requires optical cleaning solution. Do not let dew dry repeatedly, as it can etch the lens coating over time. A dew heater strip is the best prevention.
• Never Use: Avoid household cleaners, paper towels, or abrasive cloths, as these can damage the delicate optical coatings.

Battery Management

The internal battery is key to the Seestar’s portability. Proper battery care extends its lifespan.

• Charging Habits:
  • Avoid Deep Discharges: Try not to let the battery completely drain repeatedly.
  • Avoid Overcharging: While modern devices have protection, it’s generally good practice not to leave it plugged in for days on end if not in use.
  • Regular Use: If you don’t use it frequently, try to cycle the battery charge and discharge partially every few months.
• Storage: For long-term storage several weeks or months, charge the battery to around 50-60% capacity. Storing a fully charged or completely depleted Li-ion battery for extended periods can reduce its lifespan.
• Temperature: Avoid operating or storing the Seestar in extreme hot or cold temperatures for prolonged periods. This can negatively impact battery performance and longevity.

Software and Firmware Updates

Keeping the Seestar’s software and firmware up to date is crucial for optimal performance, bug fixes, and new features.

• Regular Checks: Periodically open the Seestar app and navigate to the settings or device information section. The app will usually notify you if a new firmware update is available for the Seestar unit or for the app itself.
• Stable Connection: Always perform updates over a stable Wi-Fi connection, preferably when the Seestar battery is well charged or connected to power. Interrupting an update can potentially brick the device.
• Read Release Notes: Before updating, quickly check the release notes for any known issues or specific instructions.

Storage and Transport

Proper storage and transport prevent physical damage and protect the optics.

• Original Packaging/Case: Store the Seestar in its original padded box or a dedicated carrying case when not in use. This protects it from dust, impacts, and temperature fluctuations.
• Lens Cap: Always keep the lens cap on when not observing or imaging to protect the objective from dust and accidental touches.
• Avoid Shocks: Treat the Seestar like any delicate electronic device. Avoid dropping it or subjecting it to harsh impacts.
• Temperature and Humidity: Store it in a cool, dry place. High humidity can encourage fungus growth on optics, and extreme temperatures can affect electronics and battery life.

General Best Practices

• Read the Manual: While intuitive, take a few minutes to read the user manual. It often contains specific care instructions and troubleshooting tips.
• Community Forums: Join Seestar user groups or forums online. They are excellent resources for tips, tricks, and solutions to common issues.
• Contact Support: If you encounter a problem you can’t solve, don’t hesitate to contact ZWO customer support.

By following these maintenance and care guidelines, your ZWO Seestar S50 will remain a reliable and enjoyable tool for exploring and capturing the wonders of the night sky for many years.

Comparing Seestar S50 to Other Smart Telescopes

The ZWO Seestar S50 has emerged as a leader in the nascent “smart telescope” category, but it’s not the only player.

Understanding how it stacks up against competitors like the Unistellar eVscope and Stellina/Vaonis Vespera can help potential buyers make an informed decision based on their budget, priorities, and desired level of performance.

This comparison highlights the Seestar’s unique position in the market.

ZWO Seestar S50: The Accessible Entry Point

• Price: ~$500 – $600. This is its biggest differentiator and a huge advantage.
• Aperture: 50mm 2 inches.
• Focal Length: 250mm.
• Optics: Apochromatic Triplet Refractor excellent for color correction.
• Camera Sensor: Sony IMX462.
• Key Strengths:
  • Unbeatable Price/Performance: Delivers impressive deep-sky results for its cost.
  • Extremely Portable: Smallest and lightest of the smart telescopes.
  • User-Friendly App: Very intuitive, especially for beginners.
  • Live Stacking: Engaging real-time image improvement.
  • FITS File Output: Allows for advanced external processing.
• Limitations:
  • Smallest aperture, so less light gathering than competitors.
  • Limited resolution for planetary imaging.
  • No integrated power bank requires external for long sessions.
• Ideal User: Beginners, casual astronomers, travelers, those on a budget who want to start astrophotography immediately.

Unistellar eVscope e.g., eVscope 2, eQuinox 2: High-End Visual/Imaging Hybrid

• Price: ~$2,500 – $5,000+. Unistellar models are significantly more expensive.
• Aperture: Typically 4.5 inches 114mm or 4.3 inches 108mm.
• Focal Length: Around 450mm.
• Optics: Newtonian Reflector.
• Camera Sensor: Varies by model, but generally larger and more sensitive than Seestar.
  • “Enhanced Vision” Eyepiece: Offers a unique visual experience where you look into an electronic eyepiece that displays a real-time stacked image. This is a hybrid visual/imaging experience.
  • Larger Aperture: Gathers significantly more light than the Seestar, leading to brighter and potentially more detailed views/images, especially of fainter objects.
  • Citizen Science Integration: Unistellar actively encourages users to participate in citizen science projects e.g., asteroid occultations, exoplanet transits.
  • Integrated Power: Often has long-lasting integrated batteries.
  • Very Expensive: The price is a major barrier for many.
  • Bulkier and Heavier: Less portable than the Seestar.
  • No FITS Output: Typically only outputs processed JPEGs/PNGs, limiting advanced post-processing.
  • Reflector optics can require occasional collimation.
• Ideal User: Those with a substantial budget who want a unique, hybrid visual/imaging experience, are interested in citizen science, and prioritize ease of use over deep customizability.

Vaonis Vespera and Stellina: The “Designer” Smart Scopes

• Price: ~$1,500 – $2,500+. Mid-to-high range.
• Aperture: Vespera 50mm, Stellina 80mm.
• Focal Length: Vespera 200mm, Stellina 400mm.
• Optics: Apochromatic Refractor.
• Camera Sensor: Varies by model often Sony IMX178 or similar.
  • Sleek Design: Known for their elegant, minimalist, and aesthetically pleasing designs.
  • Fully Automated: Similar to Seestar, highly automated setup and tracking.
  • Excellent Image Quality: Produce very good, well-processed images internally.
  • Integrated Filters: Some models offer integrated light pollution filters.
  • User-Friendly App: Intuitive control via smartphone.
  • Higher Price: More expensive than the Seestar, especially for the Vespera which has the same aperture.
  • Less Flexible: Often no FITS file output, limiting advanced post-processing.
  • Proprietary accessories can be expensive.
  • Vespera’s 50mm aperture for its price point can be seen as a disadvantage compared to the Seestar.
• Ideal User: Users who prioritize sleek design, fully automated astrophotography, excellent in-app processing, and have a larger budget than the Seestar allows for.

Conclusion of Comparison

The ZWO Seestar S50 stands out as the undisputed leader in the budget-friendly, entry-level smart telescope market. It offers nearly all the core “smart” features of its more expensive competitors automated setup, GoTo, live stacking at a fraction of their cost. While it has a smaller aperture than the Unistellar and some Vaonis models, its apochromatic optics and FITS file output for external processing give it surprising capabilities for its price.

If you’re looking for the absolute easiest and most affordable way to dive into deep-sky astrophotography with real results, the Seestar S50 is the clear winner.

If you have a significantly larger budget and are interested in the “enhanced vision” eyepiece or larger aperture for brighter, though potentially less customizable, results, then the Unistellar or Vaonis offerings might be considered.

However, for sheer value and accessibility, the Seestar S50 remains unparalleled.

The Future of Smart Telescopes and the Seestar’s Role

The emergence of smart telescopes like the ZWO Seestar S50 marks a significant evolutionary leap in the astronomy hobby, democratizing astrophotography in ways that were unimaginable even a decade ago.

Democratizing Astrophotography

Historically, astrophotography has been a niche hobby, accessible primarily to those with significant disposable income, technical aptitude, and a willingness to commit hundreds of hours to learning complex equipment and software. The Seestar S50 shatters these barriers:

• Lowered Entry Barrier: The financial investment is no longer prohibitive, making it accessible to a much broader audience, including students, families, and casual enthusiasts.
• Simplified Workflow: The automation handles the most challenging aspects alignment, tracking, basic processing, allowing users to focus on the joy of discovery and image capture rather than fighting with complex technical issues.
• Instant Gratification: Live stacking provides immediate visual results, which is a powerful motivator for engagement and continued learning. This stands in stark contrast to traditional methods where results might not be seen until days after data collection.
• Education and Engagement: By making astrophotography easier, it fosters greater interest in astronomy, science, and technology among the general public.

The Evolution of Smart Telescope Technology

The smart telescope market is likely to see rapid innovation driven by advancements in several key areas:

• Sensor Technology: Expect continued improvements in low-light sensitivity, larger sensor sizes, and lower noise from camera sensors. This will lead to better image quality from smaller apertures.
• Optics: While already good, further miniaturization of high-quality apochromatic optics or new optical designs could offer larger apertures in even more compact forms.
• AI and Machine Learning: More sophisticated AI algorithms could enhance everything from object identification and tracking precision to on-device image processing e.g., adaptive noise reduction, deconvolution, intelligent stretching.
• Battery Life and Power Efficiency: As users demand longer imaging sessions, battery technology and power management will undoubtedly improve, allowing for all-night sessions without external power.
• Connectivity and Cloud Integration: Better Wi-Fi, 5G capabilities, and deeper integration with cloud storage and processing services could become standard, allowing for seamless data management and even remote operation.
• Augmented Reality AR: Integrating AR features into the app could provide even more immersive and informative experiences, overlaying constellation lines, object information, or real-time data onto the sky view.
• Modularity Limited: While the Seestar is all-in-one, future smart telescopes might offer limited modularity, perhaps allowing for different focal reducers, field flatteners, or specialized filters to be easily swapped in.

The Seestar S50’s Enduring Role

Even as new smart telescopes emerge, the Seestar S50 is likely to maintain a significant and influential role in the market for several reasons:

• Pioneer Status: It has effectively defined the entry-level smart telescope segment, setting a benchmark for price, performance, and user experience.
• Community and Ecosystem: ZWO has cultivated a strong user community around its products, which provides support, shares knowledge, and offers feedback for future development. This community will continue to grow around the Seestar.
• ZWO’s Expertise: ZWO is a well-established and respected brand in the dedicated astrophotography camera and accessory market. Their deep knowledge of sensors, optics, and software gives them a distinct advantage in this niche.
• Value Proposition: Its compelling price-to-performance ratio means it will likely remain the go-to recommendation for anyone starting out in astrophotography without breaking the bank. It makes the hobby accessible to truly “anyone with a smartphone.”
• Continuous Improvement: ZWO’s commitment to regular firmware and app updates ensures the Seestar S50 remains competitive and relevant over time, potentially adding new features and improving existing ones.

In conclusion, the ZWO Seestar S50 is more than just a gadget. it’s a gateway.

It has effectively opened the doors of deep-sky astrophotography to a vast new audience, proving that captivating images of the cosmos are no longer solely the domain of experts with expensive, complex setups.

As the smart telescope market evolves, the Seestar’s legacy will be as the device that made the wonders of the night sky truly accessible to the masses, inspiring a new generation of stargazers and astrophotographers.

Frequently Asked Questions

What is the ZWO Seestar S50?

The ZWO Seestar S50 is an all-in-one smart telescope designed for automated astrophotography, integrating a 50mm apochromatic refractor, a camera, a mount, and control systems into a single, compact unit, managed entirely via a smartphone app.

Is the Seestar S50 good for beginners?

Yes, the Seestar S50 is exceptionally good for beginners.

Its automated setup, GoTo functionality, and live stacking feature remove the traditional complexities of astrophotography, making it easy to capture impressive images with minimal prior experience.

What can the Seestar S50 image?

The Seestar S50 is primarily designed for deep-sky objects like nebulae, galaxies, and star clusters.

It can also capture good images of the Moon and the Sun with a proper solar filter, and basic images of brighter planets.

Can I see through the Seestar S50 like a regular telescope?

No, the Seestar S50 does not have an eyepiece for visual observation.

All viewing and imaging are done digitally through its companion smartphone application.

How do I control the Seestar S50?

The Seestar S50 is controlled exclusively via its dedicated smartphone application available for iOS and Android connected via Wi-Fi.

What kind of images does the Seestar S50 produce?

The Seestar S50 produces digital images of celestial objects, often in JPEG, TIFF, or FITS formats.

It utilizes live stacking to combine multiple short exposures into a single, clearer, and more detailed image.

How long does the Seestar S50 battery last?

The internal battery of the Seestar S50 typically lasts for about 5-6 hours of continuous operation.

It can be powered and charged via USB-C for extended use with a portable power bank.

Does the Seestar S50 require a laptop?

No, the Seestar S50 does not require a laptop for operation. It is fully controlled by a smartphone or tablet.

However, a computer is useful for advanced post-processing of FITS files.

Is the Seestar S50 suitable for planetary imaging?

While it can capture basic images of brighter planets, its 250mm focal length is relatively short for high-resolution planetary imaging.

It’s not its primary strength, but it can show major planetary features.

Does the Seestar S50 come with a solar filter?

Yes, most ZWO Seestar S50 packages include a dedicated solar filter. It is crucial to use this filter for any solar observation or imaging to prevent irreparable damage to the device and potential eye injury if looking through an eyepiece.

What is live stacking?

Live stacking is a feature where the Seestar S50 continuously captures multiple short exposures and automatically combines them in real-time.

As more exposures are added, the image on your screen gradually improves, revealing more detail and less noise.

Can I process Seestar S50 images myself?

Yes, the Seestar S50 can save raw FITS files of individual exposures.

These files can be transferred to a computer and processed using specialized astrophotography software like DeepSkyStacker, Siril, or PixInsight for more detailed results.

What kind of tripod does the Seestar S50 use?

The Seestar S50 comes with a small tabletop tripod.

It also has a standard 1/4″-20 camera tripod thread, allowing it to be mounted on most standard photography tripods for better stability and height.

Is the Seestar S50 good for deep-sky objects in light-polluted areas?

While dark skies are always best, the Seestar S50’s deep-sky imaging and stacking capabilities allow it to perform better in moderate light pollution than visual observation.

Longer total exposure times help mitigate light pollution effects.

What is the aperture of the Seestar S50?

The ZWO Seestar S50 has a 50mm approximately 2-inch aperture.

What is the focal length of the Seestar S50?

The Seestar S50 has a focal length of 250mm.

Does the Seestar S50 have auto-focus?

Yes, the Seestar S50 features an automatic focusing system.

How long does it take to set up the Seestar S50?

Initial setup, including app download and first connection, takes about 10-15 minutes.

Subsequent setups for imaging sessions typically take only 5 minutes or less, including automatic alignment.

Can the Seestar S50 track celestial objects?

Yes, the Seestar S50 has a built-in motorized alt-azimuth mount that automatically tracks celestial objects as they move across the sky due to Earth’s rotation, allowing for long exposures.

Is the Seestar S50 good for astrophotography on the go?

Yes, its compact size, lightweight design, integrated battery, and automated setup make it exceptionally good for portable astrophotography, ideal for camping or travel to dark sky sites.

Can I use external power with the Seestar S50?

Yes, the Seestar S50 has a USB-C port and can be powered by a portable power bank, allowing for much longer imaging sessions.

Are there any essential accessories for the Seestar S50?

A larger, sturdier tripod, a high-capacity portable power bank, and a dew heater strip for humid conditions are highly recommended accessories to enhance your Seestar experience.

What is the Seestar S50’s optical design?

The Seestar S50 uses a 50mm apochromatic triplet refractor, which provides excellent color correction and sharp images.

Does the Seestar S50 replace traditional telescopes?

No, the Seestar S50 is a specialized smart telescope optimized for easy astrophotography.

It doesn’t replace larger visual telescopes or advanced modular astrophotography rigs, but it offers a unique, accessible alternative.

How does the Seestar S50 handle alignment?

The Seestar S50 features fully automatic star alignment using its internal camera and plate-solving technology.

You simply power it on, and it figures out its position in the sky automatically.

Can I share images directly from the Seestar S50 app?

Yes, the Seestar app has a built-in gallery where you can view your captured images and easily share them directly to social media or other platforms.

Does the Seestar S50 work during the day?

The Seestar S50 can track and image the Sun during the day, but only with the dedicated solar filter installed. It is not designed for daytime terrestrial viewing.

What kind of sensor does the Seestar S50 use?

The Seestar S50 uses a Sony IMX462 CMOS sensor, known for its high sensitivity and low noise, particularly in low-light conditions.

Can I update the Seestar S50’s firmware?

Yes, ZWO regularly releases firmware updates for the Seestar S50, which can be easily installed via the smartphone application.

These updates often improve performance and add new features.

Is the Seestar S50 worth the money?

For its price point and the level of automation and image quality it delivers, many users consider the ZWO Seestar S50 to be an excellent value and a highly worthwhile investment for anyone interested in accessible astrophotography.

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