Ursa Major 8'' f/6 Dobsonian
Ursa Major 8'' f/6 DobsonianUrsa Major 8'' f/6 DobsonianUrsa Major 8'' f/6 Dobsonian
Ursa Major 8'' f/6 DobsonianUrsa Major 8'' f/6 DobsonianUrsa Major 8'' f/6 Dobsonian

Ursa Major 8" f/6 Dobsonian

£349.00✓ 2 year warranty


Out of stock due 20-25 working days

Ursa Major 6" and 8" Dobsonians share the same superb GSO parabolic mirrors as StellaLyra Dobsonians but have a more traditional Dobsonian base (Teflon pads & spring tensioner) single speed focuser and 'straight' finder-scope.

This has enabled us to achieve lower prices, making them an excellent choice for anyone starting astronomy. 

About this product

Model:  ursamajor_8_f6_dob

Superb Value 8" f/6 Dobsonian telescope! 

Designed and manufactured to a very high standard by Guan Sheng Optical (GSO) in Taiwan. 

With 8" aperture this easy to use Dobsonian telescope is an excellent choice for visual astronomy.

In good seeing conditions you can observe Mars with surface shading and polar cap. Jupiters weather bands and a number of its Moons, Saturn with its rings (including the Cassini division) and Venus and its phases, are all clearly visible. 

Viewing the lunar surface will feel like you can reach out and scratch plaster! 

The 8" aperture (1.78x more light gathering ability than 6") also provides excellent views of many deep sky objects, like M42 / Orion Nebula or Galaxies like M81 and M82.

For many owners this telescope will provide a lifetime of observing. 

Ursa Major 6" and 8" Dobsonian telescopes are fitted with GSO aluminised parabolic primary mirrors with minimum 93% reflectivity and a silicon-dioxide protective overcoat to ensure the surface remains bright for years to come.  

Collimation knobs on the primary mirror cell provide easy collimation adjustment, without tools, and an integrated fan provides faster cooling. 

This 8” model also features a surprisingly good CNC-machined (not cast metal) 2" Crayford focuser for smooth, accurate focusing and zero image shift.

Fully multicoated 1.25" 9mm and 25mm Plössl eyepieces are included so views will be clear and sharp, from the outset.  

The Dobsonian base is delivered flat-packed and is easy to assemble. 

Teflon pads in both axis provide smooth movement and tension can be adjusted to achieve just the right amount of resistance.

In Altitude a spring tension system prevents the telescope from moving during eyepiece changes.


  • 203mm (8") Newtonian reflector optics
  • 1200mm focal length
  • f/5.9 focal ratio
  • 25% secondary mirror obstruction
  • Parabolic primary mirror with minimum 93% reflectivity
  • Aluminium and silicone dioxide (SiO2) protective mirror coatings
  • Sturdy primary mirror-cell with easy grip collimation knobs
  • Integrated fan provides faster cooling. 
  • Rigid, steel telescope tube with 4-vane, all metal secondary Spider and adjustable primary cell
  • CNC-machined 2" Crayford focuser with non-marring brass compression rings 
  • Smooth, stable Dobsonian mount with Azimuth tension adjustment, 4 slot eyepiece holder and front carry-handle
  • Supplied with fully multicoated 1.25" 9mm and 25mm Plössl eyepiece
  • 8x50 finderscope

Telescope Field of View Simulator

What's in the box

  • 8" Newtonian Reflector Telescope
  • Dobsonian Mount
  • 8x50 Finderscope
  • 2" to 1.25" Adapter
  • 2" 35mm Extension Tube
  • 9mm 1.25" Super-Plossl Eyepiece
  • 25mm 1.25" Super-Plossl Eyepiece


Model 8" f/6 Dobsonian
Optical design Newtonian Reflector
Aperture 203mm (6")
Focal ratio f/5.9
Focal length 1200mm
Primary mirror BK7 Parabolic primary mirror, minimum 93% reflectivity
Mirror coatings Aluminum and silicone dioxide (SiO2)
Secondary mirror Minimum 93% reflectivity
Secondary mirror holder 4-vane all metal spider
Secondary Mirror Obstruction 25%
Focuser 2" Crayford
Mount Dobsonian mount with spring tension control
Finderscope Straight through 8x50
Eyepiece 1 9mm 1.25" 52º Super-Plossl with 6mm eye-relief
Eyepiece 2 25mm 1.25" 52º Super-Plossl with 22mm eye-relief
Tube outside diameter 230mm / 9.1"
Tube length 1150mm / 45.3"
Mount Base Diameter       500mm / 19.7"
Tube weight 9.5kg / 20lbs 15oz
Shipped size OTA 128cm x 40cm x 35cm / 50.4" x 15.7" x 13.8"
Shipped size Base 58cm x 68cm x 14cm / 22.3" x 26.8" x 5.5"
Shipped weight OTA 15kg / 33lbs 1oz
Shipped weight Base 12kg / 26lbs 7oz

Downloads / Manuals


Ursa Major 8" Dobsonian Assembly Manual

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