S50 Pro EQ mode with 60 second exposures

Living in the Missouri Ozarks can be a blessing and a curse when it comes to astrophotography. From the humid summers to the sometime-brutal winters, we can end up going for a month or more without a good night for imaging and that's not even considering the other sky conditions. There are certainly areas that can lean towards Bortle 2 or 3, but I am not so fortunate. On paper, my skies are closer to Bortle 5, but that number means nothing when there are intense streetlights in every direction and neighbors with security lights always conveniently placed at exactly the wrong angle. Despite these being genuine challenges to getting under the skies, the biggest hurdle is always having enough time and energy. Between balancing a marriage, raising three boisterous teenagers, and managing the daily professional grind of software development, carving out dedicated time for astrophotography can be a significant challenge for someone in their late thirties. Time is a precious commodity, and spending hours setting up gear is not always an option.

When I first dove deep into this hobby back in 2020, I quickly learned that traditional astrophotography demands an significant amount of time and physical energy. My primary setup involves a beautiful Askar FRA600 paired with an Atik 16200 monochrome camera, all riding on a Skywatcher EQ6-R mount. It is a fantastic, highly capable rig that produces stunning deep sky images, but it is absurdly heavy. It requires meticulous physical balancing, precise polar alignment, complex software, and no small amount of time just to get running each night. By the time the heavy rig is finally collecting light, I am often exhausted before the night has truly begun.

The recent surge in smart telescopes has completely changed how I think about getting under the stars and the ZWO Seestar S50 Pro takes that to another level. Out of the box, it is quite a marvel of convenience and modern engineering. Within minutes it is capable of relatively rewarding deep-sky imaging. While the results can't truly compete with my dedicated rig, it's certainly helped me enjoy imaging even on nights when I'm otherwise too exhausted. My dedicated rig can take sometimes 30 minutes or more before I'm seeing the first results, but with the S50 Pro, I can start getting results within five minutes and most of that time is just spent choosing a target.

By default, it operates in a standard Alt-Az configuration, meaning you can set it on a picnic table, press a button on your phone, and start viewing the cosmos in minutes. It is the perfect grab and go instrument for a busy dad, whether that's on a backpacking trip or even in my own back yard. But to truly bridge the gap between a casual observation tool and a powerful, deep sky imaging device, you need to push its capabilities further. Operating the Seestar in Equatorial mode is the key and this article explores the physical and digital steps required to make that transition, unlocking the many benefits of 60 second exposures and pushing the boundaries of what this compact device can achieve.

The Limitations of Altitude Azimuth Tracking

When you first power on the device, it tracks the night sky using its default Alt-Az mount system. This means the internal motors move the telescope horizontally and vertically to keep your target centered in the frame. For visual observing or capturing very short exposures, this straightforward method works beautifully. However, as we all learned in grade school, the Earth does not rotate up and down or left and right; it rotates smoothly on a tilted axis. Because an altitude azimuth mount does not mimic this natural planetary rotation, the stars at the edges of your image will appear to spin slowly around the center of the frame as the hours pass. This optical phenomenon is known as field rotation.

To combat the blurring effects of field rotation, the standard software limits your maximum exposure time to just ten seconds. Ten seconds is certainly enough to capture the bright, blazing core of the Orion Nebula or the dense center of the Andromeda Galaxy or even the complexity of a globular cluster like M13, but it falls drastically short when you want to dive deeper into the dark. Astrophotography is fundamentally a game of gathering light. Faint dust lanes swirling in distant galaxies, wispy oxygen shells surrounding dying planetary nebulae, and the dim, glowing rivers of hydrogen scattered across the Milky Way all require long, sustained exposures to register properly on the camera sensor. When you are restricted to ten second sub exposures, you are simply skimming the surface of the night sky. Furthermore, shooting hundreds of short ten second frames creates a massive amount of individual image files. Your device must process, store, and stack all of this data internally. It is a heavy computational burden that can sometimes lead to dropped frames, slower processing times, and increased digital noise in your final composite image.

The Magic of Equatorial Tracking

The definitive solution to the frustrating problem of field rotation is equatorial tracking. By tilting the base of the telescope so that its axis of rotation aligns perfectly with the rotational axis of the Earth, the mount only needs to move in one single direction to track a celestial object as it arcs across the sky. This single axis, constant rate movement completely eliminates field rotation. It allows you to leave the camera shutter open for much longer periods without the surrounding stars trailing into unnatural streaks.

For the Seestar, making this transition means you can step up from a short 10 second exposure to as much as 60 seconds. The difference in resulting image quality is night and day, pun intended. A sixty second exposure collects six times the amount of photons in a single frame compared to the default setting. This increase in light gathering capability improves the signal to noise ratio of your resulting image. The background sky becomes smoother and darker, while the faint, delicate details of your target become much more prominent. This is the difference between "I think I see something" and immediately recognizing the celestial object.

Additionally, you capture far fewer total images to achieve the exact same total integration time. This significantly reduces the stacking workload on the internal processor of the telescope, resulting in a cleaner, sharper final photograph delivered with much greater efficiency. For someone entirely accustomed to the deep imaging capabilities of a dedicated monochrome rig, seeing that first 60 second sub exposure pop on the screen with so little effort is a testament to the capabilities of such a compact device.

Hardware Adjustments and Physical Setup

Transitioning the telescope into this advanced configuration requires some supplementary hardware and a bit of deliberate physical setup. You will need a sturdy, reliable photographic tripod and an equatorial wedge. The wedge is a mechanical base that sits securely between your tripod and the telescope, featuring fine adjustment knobs that allow you to tilt the entire unit to the correct angle.

Start by taking your tripod outside to your favorite observing spot. Point one of the tripod legs directly toward true north. It is absolutely critical that the top base of the tripod is perfectly level before you do anything else. Use a quality bubble level to ensure the platform is completely flat. Thankfully, the tripod included with the S50 Pro already has one. Any tilt in the base foundation will introduce frustrating tracking errors later in the night. Once the tripod is perfectly level, attach your equatorial wedge and secure it tightly. I happen to use the TH-10 tripod head that ZWO offers, but there are several good options out there.

Next, you must set the elevation angle on the wedge. This is where the process gets slightly counterintuitive. Traditional heavy equatorial mounts require you to set the elevation angle to match your local geographic latitude perfectly. However, because of how the internal gravity sensors in the Seestar operate when the unit is tilted on its side, you must set the wedge to the complement of your latitude. You calculate this simple math by subtracting your local latitude from ninety. For instance, living in the Missouri Ozarks, my latitude is roughly thirty seven degrees. Therefore, I had to adjust the mechanical wedge scale to exactly fifty three degrees. Don't worry if your angle isn't perfectly precise, the Seestar app will help fine tune this angle when you enable EQ mode; we will cover that shortly.

With the angle properly set, carefully mount the telescope onto the wedge. Tilting the device drastically shifts its center of gravity. If you simply attach it directly to the wedge, the entire setup becomes extremely front heavy and runs the risk of tipping over with the shorter tripod supplied by ZWO with the S50 Pro. There are ways to counteract this, thankfully, and it can be as simple as extending the legs or using a balance adapter plate. Take your time with this physical setup phase. A solid, balanced, and perfectly level foundation is paramount to flawless astronomical tracking.

Software Calibration and Polar Alignment

Once the physical hardware is securely locked in, the remaining work takes place entirely inside the mobile app. Power on the telescope and give it a moment to initialize its internal systems. Connect your smartphone or tablet to the device network and open the app. Instead of jumping straight into the sky atlas to begin observing, navigate to your profile, access the Advanced Features menu, and look for the Mount Mode settings. Tap the option to switch the device from Altitude Azimuth to EQ Mode. The software will guide you through the initial orientation. First, it will ask you to adjust the physical tilt of the device until the on screen angle value matches your local latitude. With the power button facing upward and the unit roughly aligned with true north, lock that angle in place and tap the button to get your polar alignment deviation.  

This is where the Seestar process differs from standard dedicated astrophotography systems. Instead of demanding a direct view of the celestial pole and forcing you to chase crosshairs, the Seestar app automatically handles the next steps quite fluidly. The telescope will automatically capture brief images of the star field. By analyzing these images, the internal processor calculates your exact deviation from the true celestial pole. After a moment of calculation, the screen will display your current vertical and horizontal alignment errors alongside straightforward directional arrow cues. Your goal is to use the mechanical fine adjustment knobs on your equatorial wedge to physically move the telescope in the exact directions the arrows indicate. If the application shows an arrow pointing right, you slowly pan the mount to the right; if an arrow points up, you adjust your elevation knob to tilt the setup upward.  

This process requires a gentle hand. After making a physical adjustment, you will prompt the application to take another image and recalculate your updated position. Continue refining your wedge adjustments by following the on screen arrows until both the horizontal and vertical deviations drop below one degree. When you cross that threshold, the app lets you know your polar alignment is officially successful. While chasing perfect zero error is a familiar habit from my heavy EQ6 setup, anything under one degree is mathematically more than sufficient for pristine sixty second exposures with the Seestar. Once you see that green confirmation, carefully lock down all the adjustment knobs on the wedge, tap finish, and prepare to image the deep sky.  

Experiencing the Night Sky Anew

With the polar alignment complete and the hardware locked down, you can start imaging right away. You can use the internal app catalogue to select your desired target, just as you normally would. The telescope will slew smoothly to the object, perform a plate solve routine to center it perfectly in the frame, and begin tracking the sky with precision. When you enter the main imaging screen, you will now see the option to select sixty second exposures. Watching that very first minute long sub exposure render on your phone or tablet screen is a quite a thrill, but the more time you give it, the better the result will be. The glowing core of the Orion Nebula ceases to be a blown out white blob and suddenly reveals intricate, sweeping tendrils of dark dust. The faint, delicate spiral arms of the Pinwheel Galaxy, which are normally lost in the digital noise of a short exposure, become clearly defined against the inky grey-black background of deep space.

Operating the Seestar S50 Pro in Equatorial mode changes the fundamental nature of the device. It successfully transforms the unit from a casual backyard observation tool into a capable astrophotography instrument. It provides a level of depth, clarity, and detail that often can feel more rewarding than a traditional setup, considering how little time it takes to get up and running. While I still prefer the results I can get from my primary rig, the S50 Pro does a great job.

For someone balancing a busy family life with an enduring passion for the cosmos, this specific configuration is an absolute game changer. It offers a wonderful taste of the deep, rich data collection I enjoy with my heavy monochrome rig, but in a compact package that I can carry outside in one single hand and set up in less than ten minutes. It allows me to spend less time fighting with heavy counterweights, tangled cables, and complex software, and more time sitting quietly on the back porch, perhaps with my wife or kids, sharing the incredible, quiet beauty of the universe that hangs faithfully over the Ozarks every single night.

- DRAFT COPY ONLY -