There is no good smart telescope for planets, and the closest thing to an exception is the ZWO Seestar S50 at $499 (499 €). Every instrument in this category is built around a short focal length that collects light from faint extended objects, which is the opposite of what resolving a planetary disc requires — and every published test converges on that conclusion.
Our picks at a glance
| Category | Model | Price | Why |
|---|---|---|---|
| Closest to usable | ZWO Seestar S50 | $499 / 499 € | 250 mm at 50 mm shows Saturn’s rings and the Galilean moons |
| Most focal length | Unistellar eQuinox 2 | $2,899 / 2,599 € | 450 mm, yet the Mars tests are unconvincing |
| Premium alternative | Unistellar eVscope 2 | $4,999 / 4,699 € | Same 450 mm optics, plus a Nikon OLED eyepiece |
| Most aperture | Celestron Origin Mark II | $4,299 / 5,299 € | 152 mm, but f/2.2 and 335 mm are the wrong geometry |
| Best for Moon and Sun | ZWO Seestar S30 | $399 / 399 € | Solar filter included, wide field, easy lunar sessions |
| The better answer | A classical long-focal-length telescope | — | Real focal length and a planetary camera, not a smart telescope |
1. ZWO Seestar S50 — the closest any of these gets
With 50 mm of aperture and 250 mm of focal length at f/5, the S50 is better than its smaller siblings without being a planetary instrument. It will show Saturn’s rings and the Galilean moons of Jupiter, and Jupiter’s own belts sit right at the threshold of visibility. That is the honest ceiling: you are recording evidence that a feature exists rather than producing a detailed planetary image.
Everything else about it is aimed elsewhere. The 2.1 MP sensor in vertical format and the 0.73° × 1.29° field are deep-sky specifications, and field rotation caps exposures at 30 s without equatorial mode, which needs an equatorial tripod or dedicated head. Availability is also tight, with the model regularly out of stock on the official site. It ranks first here by default, not by merit. See the S30 versus S50 comparison for its real strengths.
2. Unistellar eQuinox 2 — the most focal length, and still a disappointment
At 450 mm of focal length from a 114 mm Newtonian at f/4, the eQuinox 2 has more reach than anything else in the category, and it is still the device’s acknowledged weak point. A 450 mm f/4 optic is optimised for light collection on faint objects, not for finely sampling a planetary disc, and the tests conducted on Mars come out unconvincing. The app’s planetary mode does not compensate for that physical limit.
What the eQuinox 2 does well is deep sky, where 114 mm and 11 h of runtime make it our top pick. If you have bought one and want planets from it, treat the result as a record rather than an image, and read our deep-sky page for what the instrument is genuinely good at.
3. Unistellar eVscope 2 — the same limit, with an eyepiece
The eVscope 2 uses identical 114 mm f/4 optics at 450 mm, with a 7.7 MP sensor and a Nikon micro-OLED eyepiece. On planets, the eyepiece changes the experience without changing the physics: the disc is still under-sampled at this focal length, and no autofocus makes fine focusing slow and manual, with the tube moving when you touch the ring.
At $4,999 (4,699 €) it is the most expensive way to be disappointed by Jupiter in this ranking. Image quality is modest for the money even on the deep-sky targets it was designed for, raw file access has historically been slow through the manufacturer’s servers, and there is no carrying handle on 9 kg of instrument.
4. Celestron Origin Mark II — most aperture, least suited
The Origin Mark II has 152 mm of aperture, far more than anything else here, and it is still poor on planets — consistently so, and for a reason that is built into the design. A 335 mm astrograph at f/2.2 is optimised for flux, not for sampling a disc a few arcseconds across, and 2 µm photosites do not compensate for such a short focal length. Reviews flag planetary performance as a clear weak point.
This is the clearest illustration of the whole page: aperture alone does not make a planetary telescope. The Origin is the best instrument in this category for astrophotography, and among the worst for the Solar System’s planets, because the two jobs want opposite optical geometry.
5. ZWO Seestar S30 — the Moon and the Sun done properly
If your interest in the Solar System is the Moon and the Sun rather than the planets, the picture changes completely. The S30 at $399 includes a solar filter in the box alongside its UV/IR-cut, Hα/OIII dual band and dark frame, and its 1.20° × 2.13° field at 150 mm frames the full lunar disc comfortably. Sessions are short, easy and repeatable, which is exactly what makes it our pick for beginners.
On the planets themselves it is the weakest instrument here: at 150 mm of focal length Jupiter and Saturn stay small blobs, and this is the model’s clearest stated limitation. The S30 Pro at $699 adds definition but no focal length worth speaking of, so it changes nothing on this page.
How we picked
We did not name a winner in the usual sense, because the data does not support one. Planetary imaging depends on focal length and sampling scale, and the fifteen models we track run from 150 mm to 450 mm of focal length, with aperture ratios from f/2.2 to f/5.3 — a range designed end to end for wide-field deep-sky work. Every review sheet in our database that discusses planets reaches the same verdict, from the $399 Seestar S30 to the $4,299 Origin Mark II. The ranking above is therefore an ordering of least-bad options, and the honest recommendation sits in the section below.
What matters in this category
Focal length, not aperture, sets planetary detail
A planet is a small, bright disc a few tens of arcseconds across. Resolving detail on it requires a long focal length so that the disc covers many pixels. These instruments do the opposite deliberately: short focal lengths and fast aperture ratios maximise the light gathered from large faint objects. The Origin’s 152 mm at f/2.2 is the extreme case — the most aperture in the category and among the worst planetary results.
What smart telescopes genuinely do in the Solar System
The Moon works well: it is large, bright and forgiving, and a 1° to 4° field frames it easily. The Sun works too, with the supplied filters on the ZWO and DwarfLab models, or the Vaonis Hestia packs from 259 €. Jupiter’s moons and Saturn’s rings register as recognisable features from 250 mm upwards. Beyond that, expect nothing.
What to buy instead
If planets are your priority, buy a classical instrument with real focal length — a long-focal Maksutov, Schmidt-Cassegrain or Newtonian — and add a dedicated planetary camera for lucky imaging, or simply an eyepiece. That combination costs less than most of the smart telescopes listed above and outperforms all of them on Jupiter, Saturn and Mars. Then, if you want deep sky as well, add a $399 to $699 smart telescope alongside it: the two are complementary tools, not competitors.
Frequently asked questions
What is the best smart telescope for planets?
None of them is good. The ZWO Seestar S50 at $499 comes closest, showing Saturn’s rings and the Galilean moons at 250 mm of focal length, but it is a deep-sky instrument being used outside its design.
Why are smart telescopes bad at planets?
Because they use short focal lengths, from 150 mm to 450 mm, and fast aperture ratios to gather light from faint extended objects. Planetary detail needs the opposite: a long focal length that spreads a small bright disc across many pixels.
Does more aperture help?
Not on its own. The Celestron Origin Mark II has 152 mm, the most in this category, and planetary performance is one of its documented weaknesses because 335 mm at f/2.2 under-samples the disc.
Can I photograph the Moon and the Sun?
Yes, and well. The ZWO and DwarfLab models include solar filters, and the lunar disc fits comfortably in their fields. This is where these instruments earn their place in the Solar System.
What should I buy for planets instead?
A classical long-focal-length telescope with a planetary camera or an eyepiece. Keep a smart telescope for deep sky — see the full smart telescope ranking and our best under $500 page.