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

Ursa Major 6" f/8 Planetary Dobsonian

  (1 Review)
✓ 2 year warranty


22x in stock shipped 1-2 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_6_f8_dob

High performance 6" f/8 Planetary Dobsonian telescope! 

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

With 6" aperture, a long f/8 focal ratio and only 22% secondary obstruction, this easy to use Dobsonian telescope is an excellent choice for observing the Moon and planets. 

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! 

Whilst the long focal length suits higher magnification visual observations, the 6" aperture and high contrast optics also provide excellent views of brighter deep sky objects like M42 / Orion Nebula or Galaxies like M81 and M82.

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. 

This 6” model also features a surprisingly good CNC-machined (not cast metal) 1.25" 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.


  • 152mm (6") Newtonian reflector optics
  • 1200mm focal length
  • f/7.9 focal ratio
  • 22% 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
  • Rigid, steel telescope tube with 4-vane, all metal secondary Spider and adjustable primary cell
  • CNC-machined 1.25" 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
  • 6x30 finderscope

Telescope Field of View Simulator

What's in the box

  • 6" Newtonian Reflector Telescope
  • Dobsonian Mount
  • 6x30 Finderscope
  • 1.25" 35mm Extension Tube
  • 9mm 1.25" Super-Plossl Eyepiece
  • 25mm 1.25" Super-Plossl Eyepiece


Model 6" f/8 Dobsonian
Optical design Newtonian Reflector
Aperture 152mm (6")
Focal ratio f/7.9
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 22%
Focuser 1.25" Crayford
Mount Dobsonian mount with spring tension control
Finderscope Straight through 6x30
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 176mm / 6.9"
Tube length 1100mm / 43.3"
Tube weight 9kg / 19lbs 13oz
Shipped size OTA 127cm x 36cm x 30cm / 50" x 14.2" x 11.8"
Shipped size Base 63cm x 63cm x 14cm / 24.8" x 24.8" x 5.5"
Shipped weight OTA 10kg / 22lbs 1oz
Shipped weight Base 13kg / 28lbs 11oz

Downloads / Manuals


Ursa Major 6" Dobsonian Assembly Manual

Customer reviews

Average Rating (1 Review):  
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Rating (max 5):  
Good Beginners 'Scope
Wednesday, 27 April 2022  | 

After much indecision I ordered the 6" Ursa Major from FLO, having found much advice on-line suggesting a 6" Dobsonian as a good first telescope. Ordering was painless and delivery only took a few days, including a Bank Holiday weekend. The OTA and base arrived separately packed, with the OTA securely double boxed.
As my first telescope, I was impressed with the quality - in particular the CNC machined focuser was very well finished and smooth in operation - and the optics appeared to be in full collimation. Assembly was straightforward using the downloaded instructions, although I would point out that the holes for securing the upper part of the mount to the base are not equidistant - something to check before trying to assemble.
I have only been out once with this, on a moonless night. Stars appeared sharp, with not too much in the way of diffraction spikes. Moving both sections together was easy; however, I found using the straight through finder a problem due to a bad back. I'm sure this would not be a problem for someone younger and fitter.
Overall, I think this would be an good telescope for someone like myself, new to astronomy. The low cost does not seem to be reflected in the quality provided and the issue I had was not down to the telescope itself.


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