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The Sky-Watcher 10" Traditional Dobsonian Telescope utilizes a paraboloidal primary mirror which completely eliminates spherical aberration and features Teflon bearings. This telescope includes a 2” Crayford style focuser, two eyepieces and 9x50 finderscope.

Product Description:

SKY-WATCHER USA - 10" Dobsonian Reflector - S11620

Skywatcher Dobsonians, “RAISING the Bar on an Affordable Reflector…”

I have been away from reviewing gear for many many years, starting back in early 2000 when I began  writing about Takahashi’s, than Meade SCT’s than back to Taks and 100’s of accessories, many EQ mounts along the way and my last article and review was on the Mewlon 250 S, I was the originator of that telescope type and very honored to share and influence so many amateur astronomers by my influence to those who have used that scope as a result of that review and my 28 years of amateur experience.  I thought it was high time to bring my telescope knowledge back into play and write about a great telescope line which I am super excited about, Skywatcher’s CLASSIC Dobsonian reflectors! 

The “Classical” LINE UP…

So you’re a beginner to astronomy, Perfect! Skywatcher offers you a great line up, from a 6” to 16” models, go-to or grab and go, Skywatcher has everything an amateur needs. The Skywatcher” Classic” Dobsonian series is so potent, that an intermediate to an advanced astronomer will enjoy just about every Dob Skywatcher offers. Each size telescope in Skywatchers Classical line comes with a “paraboloidal” primary mirror which eliminates spherical aberration* plus a four-arm or “spider” vein for the secondary- mirror bracket with fine supports (0.5mm thick). This will also reduce diffraction spikes and light loss. The 6” through 10”models are accessorized to the max, so you don’t have to go overboard buying a ton of additional accessories, BRAVO Skywatcher!

THE Classical 10” DOB…ONE Serious Piece of Gear!

Skywatcher’s Dob parade concludes with their 10” “Classical” Dobsonian. This is ONE serious piece of gear! The 10” model is another example of a great telescope type, easy to set up and use, large enough to enjoy many nights of serious astronomy with better than average results if you taking it with you to a good dark sky site! 


What I love about this series is they are very simple to set up and view with, no motors or batteries and you don’t need a set up “crew” to help you when you want to get out and do some sky watching! Whether you like Lunar or planetary viewing is your main focus, the entire Classical series is also larger enough to enjoy star clusters or galaxies and many Nebula that populate our Universe. Each Classical model touts a durable fit and finish paint scheme for a life time of use, add in a “pedestal” base which is solid and stable along with a “dual handle” set up which is a first in what Skywatxcher dubs their “Tension Control Handle” Invention so you can lock the scope into position but still be able to move the telescope in ascension! (side to side)  

The 250 model is the largest in the “Classical” series Skywatchers 10” Classical flag ship which has a whopping 1200mm of focal length and wide field views, this scope was made for performance! Round out the 10” with the same durable fit and finish paint scheme as with the 6” and 8” versions, a rock solid pedestal base, exceptional duel speed focuser and a generous eyepiece bracket and away you go!    

IT was pretty simple for  to give the Skywatcher “Classical” series of Dobsonians an easy 5 out of 5 star rating, well made, exceptional optics and a solid performing telescope made to give you years of viewing excitement!





    Model 250P 10”

  • 10” (254 mm) Dobsonian-style Newtonian / 1200 mm focal length (f/4.7)
  • 2” single-speed Crayford-style focuser w/ 1.25” adaptor
  • 9×50 Straight through finder scope / Solid rocker-mount w/ Teflon bearings & tension clutch for altitude.

Note:  A paraboloid is elliptic if almost all cross sections are ellipses; it is hyperbolic if almost all cross sections are hyperbolas, thus the Skywatcher Dobs use a Parabolic primary because their cross sections ellipse.

(*) Spherical aberration is an optical effect observed in some telescope types due to the increased refraction of light rays when they strike a lens or a reflection of light rays when they strike a mirror near its edge, in comparison with those that strike nearer the center.

Set up note: Like any telescope platform, setting up your scope on a “level” viewing area and or location is essential, a level area gives you greater stability especially with a long tube reflector.

CAUTION: Never LOOK at or view the sun with any telescope that does NOT support the proper solar filtering and the designated solar equipment!  

The Sky-Watcher Traditional Dobsonian Telescope ƒ/4.7, 254mm (10") has a "paraboloidal" primary mirror to eliminate spherical aberration and a four-arm, secondary- mirror bracket with very fine supports (0.5mm thick), to reduce diffraction spikes and light loss. In addition, this model includes a 2" focuser with a 1.25" adapter, allowing the use of either eyepiece barrel size. The S11620 also includes Sky-Watcher's new tension control handle.


  • Dobsonian-style Newtonian
  • 2" single-speed rack-and-pinion focuser with 1.25" adaptor
  • 4-element Plossl 25mm & 10mm 1.25" eyepieces
  • 8X50 finderscope
  • Solid rocker-mount with Teflon bearings and tension clutch for altitude
  • Teflon bearing for azimuth


NameSky-Watcher - 10" Traditional Dobsonian TelescopeManufacturerSky-Watcher USAModelSKW-S11620In The Box10" (254mm) Dobsonian-style Newtonian 2" single-speed Crayford-style focuser with 1.25" adaptor 4-element Plossl 25mm and 10mm 1.25" eyepieces 9x50 finderscope Solid rocker-mount with Teflon bearings and tension clutch for altitude Teflon bearing for azimuthAperture254 mmFinderscope9x50Focal Length1200 mmFocal Ratiof/5Highest Useful Magnification508xLimiting Stellar Magnitude14.7Optical DesignNewtonian Reflector

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