Buy the ZWO Seestar S30 at $399 (399 € in Europe) if you want a complete, no-thought package; buy the DwarfLab Dwarf 3 at $529 to $599 (529 to 599 € in Europe) if resolution is what you are chasing. The criterion that actually decides between them is not aperture but what ships in the box: the S30 comes with its carbon tripod, the Dwarf 3 comes with none.
The 20-second verdict
Buy the Seestar S30 if this is your first smart telescope, if you want to be imaging half an hour after unboxing, and if a carbon tripod, a solar filter and a built-in Hα/OIII dual-band filter matter more to you than pixel count. At $399 (399 € in Europe) it is the cheapest complete route into automated astrophotography.
Buy the DwarfLab Dwarf 3 if you want 8.3 MP instead of 2.1 MP, a 2.93° × 1.65° field wide enough for the largest nebulae, 128 GB of onboard storage and the lighter body at 1.3 kg. Accept in exchange that no tripod is supplied, and that its equatorial mode needs a second, equatorial tripod you also have to buy.
Side by side
| Spec | ZWO Seestar S30 | DwarfLab Dwarf 3 |
|---|---|---|
| Indicative price | $399 (399 € in Europe) | $529 to $599 (529 to 599 € in Europe) |
| Aperture | 30 mm | 35 mm |
| Focal length | 150 mm | 150 mm (737 mm equivalent) |
| Focal ratio | f/5 | f/4.3 |
| Sensor | Sony IMX662 (Starvis 2) | Sony IMX678 (Starvis 2) |
| Resolution | 2.1 MP | 8.3 MP |
| Field of view | 1.20° × 2.13° | 2.93° × 1.65° |
| Mount | Motorised alt-azimuth | Motorised alt-azimuth |
| Equatorial mode | Yes, optional TH10 head sold separately | Yes, up to 60 s exposures, EQ tripod not included |
| Built-in filters | UV/IR-cut + Hα/OIII dual-band + dark, solar filter included | 3 switchable filters: VIS, Astro, Hα/OIII dual-band, solar included |
| Mosaic | Yes | Yes, 2×2 panorama |
| Battery life | 6 h | 5.5 h |
| Storage | 64 GB (eMMC) | 128 GB (eMMC) |
| Weight | 1.65 kg | 1.3 kg |
| Tripod included | Yes, carbon fibre | No |
What actually separates them
Optics and light gathering
The Dwarf 3 puts 35 mm in front of its telephoto lens against 30 mm on the S30, and works at f/4.3 rather than f/5. That is a faster optic over a slightly larger collecting area, which shortens the integration time needed to reach a given signal level. Both remain very small refractors, and neither collects enough light to make faint galaxies easy: 30 mm genuinely limits the S30 on faint objects. The gap is real but modest, a few millimetres and a fraction of a stop. Winner on optics and light gathering: the Dwarf 3, by a narrow margin.
Sensor, resolution and field
This is where the two stop being comparable. The S30 uses a 2.1 MP Sony IMX662 across 1.20° × 2.13°; the Dwarf 3 uses an 8.3 MP Sony IMX678 across 2.93° × 1.65°. Four times the pixels and a much wider frame means the Dwarf 3 captures a large nebula in one pass where the S30 has to stitch a mosaic, and it leaves far more room to crop afterwards. Both use Starvis 2 generation sensors, so per-pixel low-light behaviour is broadly similar. Winner on sensor, resolution and field: the Dwarf 3, decisively.
Battery, weight and portability
1.3 kg against 1.65 kg, and 128 GB against 64 GB, both to the Dwarf 3. The S30 answers with 6 h of battery against 5.5 h, a half-hour edge that counts on a long winter night, though its battery life drops clearly in hard frost. The decisive portability factor is not the body weight: the S30 travels with its carbon tripod in the box, so the whole kit is genuinely carry-on friendly, while the Dwarf 3 weighs 1.3 kg only until you add the tripod you had to source yourself. Winner on real-world portability: the Seestar S30, because the package is complete.
Filters, software and real cost
The S30 carries a UV/IR-cut, an Hα/OIII dual-band and a dark filter, with a solar filter in the box. The Dwarf 3 offers three switchable filters, VIS, Astro and Hα/OIII dual-band, plus a solar filter, which is the more flexible arrangement. Neither charges a subscription: all features are included on both. Real cost is where the S30 wins. $399 (399 € in Europe) is the entire bill, whereas the Dwarf 3 starts at $529 (529 € in Europe), still needs a tripod, then needs a second equatorial tripod for the 60 s exposures its EQ mode unlocks. The S30 is not free there either, since its EQ mode requires the optional TH10 head. Winner on real cost: the Seestar S30, and by more than the labels suggest.
Which one for your use case
For beginners
Set it down, pick a target in the app, wait. The S30 does that with nothing left to buy and no polar alignment to learn. The Dwarf 3 gets there too, but its polar alignment is not very intuitive and the missing tripod is one more decision before your first clear night. Winner for beginners: the Seestar S30.
For large nebulae
2.93° × 1.65° against 1.20° × 2.13°. The Dwarf 3 frames the widest emission nebulae in a single pass where the S30 must build a mosaic. Both have mosaic modes, but a single frame is faster and cleaner. Winner for large nebulae: the Dwarf 3.
For small targets and galaxies
Neither is a galaxy machine at 30 to 35 mm of aperture. The Dwarf 3 puts more usable pixels on a small object thanks to its 737 mm equivalent focal length and 8.3 MP sensor, and its 60 s EQ exposures improve the signal-to-noise ratio, provided you bought the equatorial tripod. If small targets are your priority, the ZWO Seestar S50 and its 250 mm of focal length deserve a look. Winner for small targets and galaxies here: the Dwarf 3, on resolution.
For city skies
Both carry an Hα/OIII dual-band filter, the one filter that really matters under light pollution, and both work on emission nebulae from a balcony. The Dwarf 3 lets you switch between VIS, Astro and dual-band without touching hardware. Winner for city skies: the Dwarf 3, narrowly, on filter flexibility.
For travel
1.65 kg with a carbon tripod included against 1.3 kg with nothing. Add any travel tripod to the Dwarf 3 and the totals converge, except that the S30 is already packed. The Dwarf 3 answers with IP54 sealing and NFC pairing, which are genuine field advantages. Winner for travel: the Seestar S30, on the strength of the complete kit.
Frequently asked questions
Which one should I buy, the Seestar S30 or the Dwarf 3?
Buy the S30 at $399 (399 € in Europe) if you want everything in one box and this is your first instrument. Buy the Dwarf 3 if the 8.3 MP sensor and the 2.93° × 1.65° field justify both the higher price and a separate tripod purchase.
Does the Dwarf 3 really cost $549?
It is listed between $529 and $599 (529 to 599 € in Europe) depending on the retailer, and no tripod is supplied. Budget for a tripod on top, and for a second equatorial tripod if you want EQ mode.
Does either one require a subscription?
No. Both the Seestar S30 and the Dwarf 3 include all their features with no subscription.
Can both do equatorial mode?
Both can, and neither does it for free. The S30 needs the optional TH10 head, sold separately. The Dwarf 3 supports exposures up to 60 s but requires an equatorial tripod that is not included.
Which is better under a light-polluted city sky?
Both ship with an Hα/OIII dual-band filter and both perform on emission nebulae from a city. The Dwarf 3 has a small edge with three switchable filters. For a wider look at the field, see the Seestar S30 Pro, the Vaonis Vespera III, or browse all comparisons.