ZWO Seestar S50 Review: The Best Budget Smart Telescope?

Most ZWO Seestar S50 review write-ups were published when the device was the newest thing in astronomy. This one is written from the other end of its life, because in early 2026 ZWO confirmed it had stopped making the S50 and is preparing a Seestar S50 Pro to replace it. That changes the buying question. The S50 is still a genuinely good smart telescope, but you are now choosing between remaining new stock, the second-hand market, and simply waiting. Here is what the S50 actually does well, where it falls short, and whether it still makes sense for a UK beginner.

If you are cross-shopping the whole category first, our best smart telescopes guide and the S30 vs S50 vs Dwarf 3 comparison put the S50 next to its rivals.

What the Seestar S50 is

The Seestar S50 is an all-in-one smart telescope: optics, camera, motorised mount, focuser and battery in a single 2.5kg box that sits on a small tripod. You do not look through it. You set it on the ground, level it, open the Seestar app on your phone, tap a target, and the scope finds it, tracks it, and stacks a live image that slowly cleans up on your screen. For anyone who has struggled to align a traditional mount in the cold, that workflow is the whole point. If you are new to the idea, smart telescopes explained covers how the automation works.

The optics are a 50mm apochromatic triplet with a 250mm focal length, giving a fast f/5 ratio that suits short exposures. Behind that sits a Sony IMX462 sensor at 1920 x 1080 (about 2 megapixels), 64GB of onboard storage, and a 6000mAh battery ZWO rates at roughly six hours, all confirmed on the ZWO Seestar S50 product page. It weighs 2.5kg and packs down to about 257mm tall, so it genuinely fits in a daypack.

Image quality: what you can really capture

The honest headline is that the S50 produces images that look astonishing to a beginner and modest to a seasoned astrophotographer, which is exactly the right target for the price. Its strengths are large, bright deep-sky objects and the Moon and Sun.

Independent testing, including the BBC Sky at Night Magazine review, has pulled clean results from the Orion Nebula in around 120 stacked frames and the Whirlpool Galaxy in roughly 400 frames, with images that keep improving the longer you let the scope stack. The single most useful feature is the built-in dual-band filter (OIII 30nm and H-alpha 20nm), which lets emission nebulae like the North America Nebula come through even from heavily light-polluted gardens. For a UK user under orange suburban skies, that filter is the difference between a blank frame and a recognisable nebula.

There is also a UV/IR cut filter for broadband targets and a solar mode with a supplied solar filter for sunspots. Scenery mode turns it into a long-lens daytime camera, which is a fun extra rather than a reason to buy.

Where the S50 falls short

Two limits matter. First, planets. A 250mm focal length is simply too short for planetary detail, so Jupiter and Saturn show up as small, basic discs rather than the banded, ringed views people imagine. If planets are your priority, a traditional scope is the better tool, and our guide to the best telescopes for viewing planets explains why aperture and focal length win there.

Second, the sensor is small and portrait-oriented, so wide targets can get clipped, and long single sessions can leave noisy corners from field rotation. The practical fix is to stack across more than one night, which cleans the corners up noticeably. None of this is a dealbreaker for the objects the S50 is built for, but it sets a realistic ceiling.

The 2026 problem: buy, wait or go second-hand

This is where the review has to be current. ZWO’s CEO confirmed at NEAF 2026 that S50 production has ended and an S50 Pro is in internal testing, potentially arriving toward the end of 2026. The Pro is expected to be white to match the S30 and S30 Pro, and given the S30 Pro launched well above the S30, a meaningful price rise is likely.

So the decision splits three ways. Paying full price (around £539 in the UK) for the last of the new stock only makes sense if you want to start imaging now and do not want to gamble on an unannounced launch date. A used S50 in good condition, often around £300 to £400, is arguably the sweet spot, because the hardware is proven and the app is still updated. Waiting for the S50 Pro suits anyone patient enough to buy an unreleased product at an unknown price. If you would rather buy new and current, the smaller Seestar S30 and the DwarfLab Dwarf 3 are both still in production.

Buying second-hand? Check the tripod thread and app pairing work before you pay, and confirm the seller can update to the current Seestar app. Check price on the used market rather than assuming a fixed figure.

Verdict

The Seestar S50 earns its reputation. It is the smart telescope that made app-driven astrophotography normal, and its light pollution filter makes it especially well suited to British skies. The caveats are the ones every smart scope shares (weak on planets, a small sensor) plus one that is specific to timing: it is a discontinued product with a successor coming. Buy it if you want proven results today, ideally used at a fair price. Wait if you can hold out for the S50 Pro. Either way, it remains one of the easiest and most rewarding first telescopes you can own.

Frequently asked questions

Is the Seestar S50 still worth buying in 2026? Yes, with a caveat. The hardware still delivers excellent beginner results and the app is actively updated, but ZWO has discontinued it and an S50 Pro is expected later in 2026. Buying used at a fair price is the strongest case; paying full price for new stock only makes sense if you want to start imaging immediately.

Can the Seestar S50 see planets clearly? Not in detail. Its 250mm focal length is too short for planetary imaging, so Jupiter and Saturn appear small and basic. It is built for deep-sky objects, the Moon and the Sun, not planets. For planetary views, a traditional telescope with more focal length is the right choice.

Does the Seestar S50 work in light polluted areas? Better than most beginner scopes. Its built-in dual-band OIII and H-alpha filter lets emission nebulae come through even from heavily light-polluted city and suburban gardens, which is one of its biggest advantages for UK users.

What is the difference between the Seestar S50 and the S30? The S50 has the larger 50mm aperture and longer 250mm focal length, giving more reach on small targets like galaxies. The S30 is smaller, lighter and cheaper with a wider field. The S50 is discontinued while the S30 remains in production, which now factors into the choice.

Do I need a laptop or extra kit to use the Seestar S50? No. Everything is built in, and you control it entirely from the free Seestar app on a phone or tablet. You just need a level surface, the supplied tripod, and clear sky. A power bank extends sessions beyond the roughly six-hour battery.