Seestar S30 Pro vs S50 Pro: Which ZWO Smart Telescope Should You Buy?

The Seestar S30 Pro and S50 Pro are the two telescopes most people end up choosing between in 2026. They share an app, a 1/1.2-inch 3840 × 2160 sensor format, a 63° wide camera, a built-in dual-band filter and a solar filter in the box. What separates them is aperture, field of view and weight, and those three things decide what each one does best.

We haven’t tested either telescope ourselves. This comparison draws on ZWO’s spec pages, live Amazon prices from November 12, 2026, and reviews by BBC Sky at Night, Digital Camera World, Live Science, Fstoppers and AstroBackyard. Check today’s price before you buy.

Specs side by side

Aperture: 2.8× the light

Light-gathering scales with the area of the lens. A 50 mm lens has (50 ÷ 30)², or about 2.8 times, the area of a 30 mm lens. In practice, the S50 Pro builds the same signal in roughly a third of the time, or goes deeper in the same session.

That matters most on faint, small targets: galaxies like M51 and M101, planetary nebulae and the outer arms of spirals. The S50 Pro’s longer focal length also puts more pixels on each object. To see how much stacking time a target needs on each scope under your sky, try the integration time tool and switch between the two.

On planets, neither scope is the right tool. ZWO says neither is intended for planets. Jupiter comes out about 20 pixels across on the S50 Pro and about 12 on the S30 Pro. BBC Sky at Night caught Jupiter and its four big moons with the S30 Pro but no surface detail, and Fstoppers saw a small dot. If planets matter, read our best smart telescope for planets guide.

Field of view: what each frames better

The S30 Pro’s shorter focal length gives it the widest native field we track, about 4° × 2.2°. The S50 Pro’s is about 2.45° × 1.38°.

The S30 Pro frames better:

• The Andromeda Galaxy, about 3° long, fits in one S30 Pro frame. The S50 Pro needs a two-panel mosaic. Compare M31 on the S30 Pro with M31 on the S50 Pro.
• The Pleiades (about 110′) fit on the S30 Pro and need two panels on the S50 Pro. See the Pleiades on the S30 Pro.
• The North America Nebula (about 2° × 1.7°) sits comfortably in the S30 Pro’s frame and overflows the S50 Pro’s. Check NGC 7000.

The S50 Pro frames better:

• Medium nebulae such as the Orion Nebula and the Rosette fit on both, but fill more of the S50 Pro frame, so you keep more detail after cropping. See M42 on the S50 Pro.
• Small galaxies like the Whirlpool are tiny in a 30 mm frame. Compare M51 on the S50 Pro.

Both scopes can build deep-sky mosaics, and both use the wide camera for 8K Milky Way stitching, so the S50 Pro can still cover big targets with more panels and time.

Weight, battery and storage

At 1.65 kg, the S30 Pro fits in a daypack or carry-on with room to spare. The S50 Pro’s 2.8 kg is still portable, but it’s a “drive to the dark site” scope rather than a hiking companion. Our best smart telescope for travel guide ranks the S30 Pro first for that reason.

ZWO rates the S50 Pro at up to 9 hours on its 10,000 mAh battery (first quoted as 7 hours) and the S30 Pro at about 6 hours on 6,000 mAh. Digital Camera World got well over six hours from the S50 Pro; AstroBackyard notes it drops in the cold. Both charge over USB-C, and the S50 Pro also accepts 12 V. Both have 128 GB of storage.

Sensors and the review record

The S30 Pro uses Sony’s IMX585. The S50 Pro uses an OmniVision OS08B10 of the same 1/1.2-inch size and pixel pitch, and AstroBackyard notes the switch away from Sony “has caused controversy.” Reviewers still praise the S50 Pro’s images, and Digital Camera World called it a versatile two-camera telescope with impressive imaging.

The S30 Pro has a longer track record. BBC Sky at Night gave it 4 stars, Fstoppers billed it as the ultimate beginner smart telescope and noted capture continues if the app disconnects, and Space.com picks it for portability. Digital Camera World’s cons were full reliance on the phone app and frequent data downloads. For the S50 Pro, Live Science found the included tripod very short and typos in the app.

EQ mode and accessories

Both support EQ mode, which removes field rotation and allows longer exposures. The S50 Pro needs only ZWO’s TH10 head (about $94). The S30 Pro also needs the taller TC20 tripod, or buy the TH10 + TC20 bundle for about $180. That narrows the real price gap if you plan to use EQ mode. Our EQ mode explainer shows when it’s worth it.

Verdict by user type

• Backyard imager, mostly galaxies and nebulae: S50 Pro. More light, finer sampling, and the tripod and case are included. Check the S50 Pro price.
• Traveler, hiker or apartment dweller: S30 Pro. Half the weight and the wide field suit grab-and-go nights. Check the S30 Pro price.
• Big nebulae, Andromeda and Milky Way panoramas: S30 Pro, which frames them in one shot.
• First telescope, unsure of the hobby: S30 Pro, or the cheaper S30 Plus covered in S30 Plus vs S30 Pro.
• Replacing an original S50: S50 Pro, its direct successor. See Seestar S50 discontinued.

How we compared

Fields of view and pixel scales are computed from each sensor’s pixel grid, 2.9 µm pixels and ZWO’s focal lengths; framing results come from the same math as our FOV calculator. Scores weight image quality and optics at 35%, ease of use at 25%, portability and build at 20% and value at 20%. More on how we research.