Two models, the numbers decide
Sky-Watcher Skyliner 250PX or GSO Dobson 300/1500?
Sky-Watcher Skyliner 250PX — 254 mm, €950. GSO Dobson 300/1500 — 300 mm, €899. The same method as everywhere on this site: the numbers first, the verdict from them.
Same family (250–300 mm Dobsonian): what changes between these two is aperture, bulk and price — not character.
Side by side
The GSO Dobson 300/1500 collects 1.4× more light — that is what aperture buys.
| Sky-Watcher Skyliner 250PX | GSO Dobson 300/1500 | |
|---|---|---|
| Aperture | 254 mm | 300 mm |
| Focal ratio | 1200 mm · f/4.7 | 1500 mm · f/5.0 |
| Typical weight | 38 kg | 33 kg |
| Setup time | 15 minutes | 15 minutes |
| Learning curve | 3 out of 5 | 3 out of 5 |
| Useful magnification | ≤ 508× | ≤ 600× |
| Resolution (Dawes) | 0.5″ | 0.4″ |
| Observed price | €950 (seen 2026-08-17) | €899 (seen 2026-08-30) |
The same sky, through both
These circles are simulations, computed from the aperture, the magnification and the sky — indicative, not exact. A real night also depends on the turbulence, your eyes and your experience. Closer to the truth than the photo on the box; still not a promise.
The Moon
Saturn
The Orion Nebula
The Andromeda Galaxy
Choose the Sky-Watcher Skyliner 250PX if…
The numbers give it few arguments — the other wins this one.
Full page on the Skyliner 250PX →
Where to buy
- Astroshoppaid link€693 seen 2026-08-23ships DE, FR, EU
- Amazon.frships FR
- First Light Opticsships GB
- Optique Unterlindenships FR
- Pierro Astroships FR
- Teleskop-Expressships DE, EU
1 of these 6 links earn us a commission, marked above. Sorted by price, never by what pays. How this site is funded.
Choose the GSO Dobson 300/1500 if…
- budget decides: €51 less
- you want the most sky: 1.4× the light
- it has to be carried: 5 kg lighter
Full page on the Dobson 300/1500 →
Where to buy
- Astroshoppaid link€899 seen 2026-08-30ships DE, FR, EU
- Amazon.frships FR
- First Light Opticsships GB
- Optique Unterlindenships FR
- Pierro Astroships FR
- Teleskop-Expressships DE, EU
1 of these 6 links earn us a commission, marked above. Sorted by price, never by what pays. How this site is funded.