Sky-Watcher · Dobsonian
Sky-Watcher FlexTube 250P
10-inch collapsible Dobsonian brings serious aperture to observers who need a telescope that actually fits in their car
Price updated Mar 22, 2026
Performance Scores
Overview
The Sky-Watcher FlexTube 250P gives you a 254mm (10-inch) primary mirror at f/4.7, which means genuinely impressive views of deep-sky objects like galaxies, nebulae, and star clusters, without the bulk of a traditional truss Dobsonian. The collapsible strut design reduces transport length significantly, making this a realistic choice if you lack a dedicated observatory or large vehicle. At this aperture, you can expect to resolve the Andromeda Galaxy's dust lanes, split tight double stars, and pull faint Messier objects out of moderately dark skies.
The included 25mm and 10mm eyepieces give you magnifications of roughly 48x and 120x to start, though most observers will eventually want to expand their eyepiece collection. The dual-speed Crayford focuser handles fine focusing well, which matters at fast focal ratios where focus is less forgiving. A few honest notes: at 19kg, this is not a lightweight grab-and-go scope, and fast mirrors like this one benefit from careful collimation.
The 3.9 Amazon rating suggests some users encounter quality control variation, so inspect yours carefully on arrival. Overall, for visual deep-sky observing on a budget, this telescope offers exceptional light-gathering capability at a competitive price.
At a Glance
254mm
Aperture
f/4.7
Focal Ratio
19.05kg
Weight
1200mm
Focal Length
Specifications
Key Features
- 254mm aperture gathers enough light to show structure in galaxies and resolve globular clusters from suburban or rural skies
- Collapsible strut design reduces storage footprint and fits into a standard car boot, unlike full-length truss Dobsonians
- Dual-speed Crayford focuser allows precise focus control, which is particularly useful at the fast f/4.7 focal ratio
- Fully multi-coated mirrors with 94% reflectivity maximize the light that actually reaches your eye
- Includes two eyepieces and an 8x50 finder scope, giving you a functional complete setup from the first night
- Tension control handles allow smooth manual tracking without requiring perfect balance, reducing setup fuss
- Collimation is maintained when collapsing and extending the tube, reducing the adjustment needed between sessions
Customer Reviews
96 reviews
I have never owned or operated a telescope before but I began looking for a beginner scope for over a year now. Upon several reviews and forum ratings, I originally went with the Celestron 127EQ (Big Mistake) So I immediately returned it. Not only was the mount hard to maneuver but darn near impossi...
I purchased this after getting a cheap scope with an unstable tripod. Reading the reviews the Dobsonian mounts were easy to use and great for the backyard. The telescope arrived in two boxes like described and I had already watched YouTube videos on assembling. It really was easy and anyone who has ...
If you’re looking for tons of practice collimating telescopes but none of the reward of a clear image of the night sky, this is the telescope for you. I’ve owned this scope for about a month and a half now and I haven’t gotten one single clear image out of it. I’ve tried everything: collimating it c...