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Reviews about this item

Review Summary

2026-05-28T11:08:24

Rated 5 out of 5

The right telescope for some, maybe not others.

My wife bought me an open box model. I'd been wanting a large telescope for some time. I was looking at 10" models and she suggested I search Adorama. I found the 12" and it was in my price range. The scope is amazing. Things are bright, so bright. I've been using an EQ mount for years and was worried the dobsonian would be annoying. With such a wide FOV it hasn't been a problem. The telescope is amazing and there is a bit of a learning curve going from 130 mm to a 305 mm. Because of the brightness it's harder to locate things. This is a heavy telescope. Close to 90 lbs with base. I live in a rural area so I leave mine outside. Possibly you could haul it in a car with a lot of care. A van or suv would be safer. The telescope comes with two 1.25" eyepiece and several other things. Camera mount, phone mount, focuser tube extension, and some tools. Collimation is a must out of the box. If you use a laser collimator the laser probably needs to be tuned. Make sure you check the laser first. I'm very happy with the telescope even though I haven't been able to use it much due to weather. I would definitely recommend this telescope. Things to consider are the size, the weight, and will you have to haul it to an observation area. While the truss design makes it more portable I think it's also an opportunity for stray light to enter. I would have never considered buying an expensive open box item from anyone but Adorama. I have trust issues. I've been shopping Adorama for many years and I know I can trust them.

Gene P.

2021-03-26T08:58:49

Rated 1 out of 5

Difficult to Impossible to Make Usable

Cannot caliber or collimate to make telescope usable. Instructions are vague and/or non-existent. Found Youtube video showing how to collimate using a laser collimator which required another purchase to make usable. Still not working. Currently using as very expensive dish towel rack.

PAUL G.

2021-03-18T08:48:42

Rated 5 out of 5

Excellent scope

Easy to collapse and transport. Assembly was a breeze.

GABRIEL M.

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Sky-Watcher Flextube Dob Specifications

  • Optical Design

    Newtonian (Parabolic)

  • Lens Material

    Grade A annealed Glass

  • Aperture (Diameter)

    254mm

  • Focal Length

    1200mm

  • F-Ratio

    F/5

  • Secondary Mirror Diameter

    58mm

  • Highest Practical Power

    508x

  • Faintest Stellar Magnitude

    14.7

  • Resolving Power

    .59 arc sec

  • Finderscope

    8x50 RA Viewfinder

  • Focuser Diameter

    2", 1.25" adapter

  • Diagonal

    Internal

  • Eyepiece(s)

    1.25" Plossl 25mm and 10mm

  • Mount Type

    Dobsonian

  • Slow-Motion Control

    Manual with Tension adjust

  • Accessory Tray

    Standard

  • Ground Board Weight(s)

    12.5Kgs

  • Tube Weight

    33 lbs

  • Warranty

    Sky-Watcher warranty

0 Accessories for Sky-Watcher 10" Flextube 250P Collapsible Dobsonian Telescope

About Sky-Watcher Flextube Dob

The Sky-Watcher Flextube 250P Collapsible 10" DOB is an very satisfying telescope to own, an instrument that will provide a lifetime of continuing exploration of the heavens. This telescope provides all the capability and value you are seeking in a large aperture telescope. Sky-Watcher's revolutionary truss-support concept allows the optical tube's front and back cells to collapse together, aligning on the truss support rods which can then be locked down for easy and secure telescope transport.

This one piece, low-hassle OTA design is mechanically simple and results in a large aperture telescope that can be reasonably handled and transported by one individual. This innovation gives Sky-Watcher users tremendous functional ease-of-transportability. With this telescope you have tremendous light gathering power. Prominent deep-space objects seen well in an 8" SW DOB, such as diffuse emission nebulae in the summer sky like the Lagoon (M8), Trifid (M20) and Swan (M17); the stunning globular star clusters M13 and M92 in Constellation Hercules; the awesome winter sky's Great Orion Nebula (M42) in Constellation Orion and the enormous local galaxy group companion the Andromeda Galaxy (M31) in Constellation Andromeda, to name a very few, will appear more spectacular, brilliant and wider in extension in a SW 10" DOB.

Many challenging objects for an 8" aperture now come into their own with the SW 10" DOB: the planetary nebula the Crab (M1), a supernova remnant, requires a 10" aperture to truly begin to appreciate the several subtle, gaseous filamentary structures. M33 the spiral galaxy in Constellation Triangulum exhibits significantly more open arm structure. The Rosette Nebula in Monoceros begins to show the discernable pattern of a blooming rose. M51, the fascinating spiral Whirlpool Galaxy, displays remarkable greater structural detail in a 10" aperture vs. 8" diameter size telescope.

There is no question the incremental resolving power of a 10-inch aperture is visually impressive when compared to an 8-inch. Therefore, it is no wonder then that the 10" aperture is overtaking the 8" as the serious amateur astronomer's aperture of choice in a Dobsonian telescope. Sky-Watcher's compact, collapsible optical tube design makes the decision to step up in aperture to a 10" even easier.

Sky-Watcher Flextube Dob Features

  • The Sky-Watcher 10" DOB utilizes quality components throughout
  • The polishing process for primary and diagonal mirror yields smooth mirror surfaces ensuring good contrast and properly corrected optics show minimum alterations to the optical wave-front
  • The standard-equipment backlash-free 2" Crayford Focuser insures ultra smooth focusing adjustments
  • An 8x50mm Right Angle optical viewfinder provides both magnification and light gathering to help narrow your search for those elusive fuzzies when star-hopping
  • To ensure mechanical ease-of-use, SW uses a high-performance Teflon bearing system in both axes combined with tension adjustment in altitude to facilitate setting the appropriate amount of friction

Key Features

  • Sky-Watcher 10" DOB utilizes quality components throughout

What's in the box:

  • Sky-Watcher 10 " Dobsonian 1200mm f/5.0
  • 2 " Crayford Style Focuser
  • 1.25 " Adaptor
  • 10mm Plossl Eyepiece
  • 25mm Plossl Eyepiece
  • 8x50 Viewfindrer
  • Solid Rocker Mount with Teflon Bearings & Tension Clutch
  • Sky-Watcher 2 Year Warranty