Ursa Major 8 Inch f6 Dobsonian Telescope

Product Description

NEW updated model with robust azimuth roller-bearing assembly. Designed and manufactured to a very high standard by Guan Sheng Optical (GSO) in Taiwan. With an 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. Jupiter's weather bands and several of its Moons, Saturn with its rings (including the Cassini division), and Venus and its phases are also 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 the M42 / Orion Nebula or Galaxies like M81 and M82. For many owners, this telescope will provide a lifetime of observing.

Ursa Major 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.

Teflon pads provide smooth altitude (up-down) movement, and tension can be adjusted to achieve the right amount of resistance. A spring tension system prevents the telescope from moving during eyepiece changes.A robust roller-bearing assembly provides smooth, reliable azimuth (left-right) adjustments. Metal plates above and below the bearings prevent them from sinking into the softer wood (no divots!), so the movement remains smooth, even after years of use.

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

Download the Manual Here

Features
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 silicon 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, four slot eyepiece holder and front carry-handle
Robust roller-bearing assembly provides smooth, reliable azimuth adjustments.
Supplied with fully multicoated 1.25" 9mm and 25mm Plössl eyepiece
8x50 finderscope