ZWO SeeStar S50 Pro Dual 4K Smart Telescope

The original Seestar S50 changed what beginners could expect from a small telescope. Instead of assembling a mount, camera, computer, guide system, and collection of cables, you could set one instrument on a tripod, choose a target in the app, and watch a deep-sky image build on your phone. It made astrophotography approachable without making the night sky feel ordinary.

The Seestar S50 Pro keeps that wonderfully simple experience, but gives the imaging system much more to work with. Its aperture remains 50 mm, so this is not a larger version of the S50. The important changes are in the optics, cameras, drive system, software access, power, and the range of pictures it can create.

A new four-element optical system feeds a larger 4K telephoto camera with a 2.8° field of view. A second 4K wide-angle camera opens a 63° view for the Milky Way, constellations, star trails, and nightscapes. The Pro also adds a precision near-zero-backlash drive, open ASCOM Alpaca support, a 10,000 mAh battery, 128 GB of storage, and a broader set of automated imaging tools. It is still a Seestar—set it down, connect the app, and choose what you want to photograph—but it is no longer limited to one camera and one way of seeing the sky.

The Whole Imaging System in One Hand

The S50 Pro combines the telescope, cameras, motorized mount, electronic focusing, filter system, dew control, image processing, and smart controller in one instrument weighing 2.8 kg (6.2 lb.). The folded body measures just 140 × 149 × 268 mm (5.5 × 5.9 × 10.6 in.).

In standard alt-azimuth mode, level the tripod, connect through the Seestar app, and select a target. The S50 Pro locates and centers the object, tracks it, captures a sequence of exposures, and stacks them as you watch. A beginner can photograph the Orion Nebula on the first clear night; an experienced observer can enjoy a productive session without assembling a conventional imaging rig.

Two Cameras, Two Views of the Sky

The telephoto side uses a 50 mm, 260 mm focal-length, f/5.2 four-element apochromatic optical system that includes ED glass. Its 1/1.2-inch sensor records 8.3-megapixel images at 2160 × 3840 resolution and covers a 2.8° field. This is the camera for nebulae, star clusters, the Moon, the Sun with the supplied solar filter, and brighter galaxies. Compared with the original S50, the larger sensor provides substantially more framing room at essentially the same image scale.

The second camera is a genuine wide-angle imaging system rather than a simple finder. Its 6 mm f/1.75 lens and 8.3-megapixel sensor cover 63° of sky, making it the natural choice for the Milky Way, constellations, meteor showers, star trails, and landscapes beneath the stars. It can recognize constellation patterns, autofocus, and process the foreground separately from the tracking sky so the land remains sharp while the stars are aligned.