An easy to use low maintenance beginner telescope. The compact size also makes it an excellent choice for taking on holiday.
The included eyepieces are noticeably better than those supplied with other tabletop Dobsonians so you can expect good views from the outset.
Requires a sturdy garden table to stand on.
About this product
Part Number: BM-DOB640102
Ursa Major 102mm Tabletop Dobsonian Telescope
The Ursa Major 102mm tabletop Dobsonian telescope is an affordable, highly portable beginner telescope.
It is mounted on a compact Dobsonian base for convenient grab-and-go astronomy. The base is supplied flat-packed and is quick and easy to assemble.
Features a 102mm f/6.3 collimateable mirror-set and is supplied with two high quality, fully multi-coated Astro Essentials super Plossl eyepieces so you can expect clear, sharp views from the outset.
Suitable for observing the Moon, bright planets, star clusters, bright galaxies and nebulae.
It also includes a handy FLO red-light keyring torch to preserve night vision adaptation.
Diameter of Primary Mirror: 102 mm (4.02")
Telescope Focal Length: 640 mm (f/6.3)
Length of optical tube: 546 mm (21.5")
Weight, fully assembled: 4.72 kg (10.4 lbs)
- Includes 10mm & 26mm 1.25" Fully Multi-Coated Plossl eyepieces
- Magnifications (with optics supplied): 64x and 25x
- Red Dot Finder
- Useful Astro Essentials Collimation Cap Included
- 1.25" Rack and Pinion Focuser
- Wooden MDF Alt-Azimuth Mount with Adjustable Tensioners
- Handy Eyepiece Storage Shelf
Telescope Field of View Simulator
The following optional accessories will enhance your enjoyment of this telescope:
A 2x Astro Essentials barlow increases the magnification of the included eyepieces. When used with the 10mm eyepiece, the magnification increases to 128x. With the 26mm eyepiece, the magnification is 50x.
A 0.9x 1.25" Moon filter reduces glare when observing the Moon for more comfortable viewing.
Most astronomers own three or four eyepieces. We recommend you become familiar with the two supplied before ordering more, but we are happy to advise if you are in a hurry.
We also recommend a warm coat, thick socks and a woolly hat!
What's in the box
- Telescope Tube
- Dobsonian Base
- Red Dot Finder
- 10mm Super Plossl Eyepiece
- 26mm Super Plossl Eyepiece
- Collimation Cap
- Red Light Keyring Torch
|Optical Design ||Newtonian Reflector |
|Aperture ||102mm (4") |
|Focal Length ||640mm (25.2") |
|Focal Ratio ||f/6.3 |
|Focal Length of Eyepiece 1 ||10mm |
|Magnification of Eyepiece 1 ||64x |
|Focal Length of Eyepiece 2 ||26mm |
|Magnification of Eyepiece 2 ||25x |
|Finderscope ||Red dot finder |
|Optical Tube ||Plastic |
|Highest Useful Magnification ||245x |
|Resolution (Rayleigh) ||1.35 arc seconds |
|Resolution (Dawes) ||1.14 arc seconds |
|Light Gathering Power (Compared to human eye) ||212x |
|Average Rating (2 Reviews): |An excellent first telescope
10 October 2023 | Martyn
This was purchased as a present for a young relative beginning in astronomy. At this stage it should be all about memories: craters on the moon, Jupiter and the Galilean satellites and the rings of Saturn. It shouldn't be about wobbly mounts, mediocre optics and gradual frustration. The fevered reading of telescope reviews is a thing of the future! Before handing it over I gave the telescope a test drive and spent a very happy hour looking upwards. The plastic cover over the primary mirror end is a nice touch and prevents fiddling from young fingers - after collimation (easy to do with the supplied collimation cap and nicely held once done). This is an excellent, and rugged, little performer which will, if you keep the eyepieces sensible (the ones supplied are a good kick-off), deliver some lovely low to medium power views. It is very easy to set up and use. I've handed the telescope over and it has given a lot of pleasure - and early practice in the essential astronomy skill of finding gaps in the clouds. FLO (as always, excellent service) may like to consider plastering the stand with stickers of the moon and planets. These have been applied by the recipient and they look a good upgrade!
13 January 2023 | Clive
Really pleased with this telescope, came next day, easy to assemble and quality was lot better than I expected for this price as a beginner this telescope is probably the best first step to starting in astronomy and obviously experience will tell but for me now this is ideal.
Please fill in the form below to ask a question.
Q1. What are the dimensions/weight?
Total dimensions fully assembled:
35cm width, including telescope focuser
55cm by 25cm, including the focuser
Total weight 5kg