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Home > Telescopes > Reflectors > Tabletops & Dobsonians
What is a "Dobsonian"?
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telescopes knowledge  Invented by John Dobson in the 1950s (he called it a sidewalk telescope), it is a basic altitude/azimuth mount that does not follow the motion of the stars. It is therefore less technically advanced than most other mounts, but tends to be very well balanced and have smooth operation, as well as being very compact, portable and easy to make. It is a design favored by amateur telescope makers.

The Dobsonian mount consists of three major parts. Azimuth (side-to-side) motion is provided by a turntable, on top of which sits a large box. Into the upper sides of the box are cut two semi-circular cutouts. Two disks are fixed to either side of the telescope tube at the balance point, and fit into the cutouts on the box to provide altitude (up-and-down) motion. The various bearing points are lined with several pieces of teflon (typically, although felt is also sometimes used) as a bearing surface.

The entire mount is quite small in comparison to typical star-tracking systems, and can be easily transported. This has made it a favourite of amateur astronomers because it can be carried to star parties in the back of a small car and set up in moments. The result has been a fixation with ever-larger telescopes, which would otherwise require huge "traditional" mounts. Whereas a 8" Newtonian would be considered large 30 years ago, today 16" systems are common, and huge 32" systems not all that rare.

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Telescope Designs
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subject related telelscopes   In general, there are two kinds of telescope systems. One is the Optical Telescope. This is our main manufacturing base. The other is the radio telescope, which is used for National & Scientific research . We manufacture only a few of these.
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Telescope Reviews
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   Telescope reviews from our clients and end users. Please feel free to post your own comments.
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Tabletops & Dobsonians  
76mm/3"inch penguin table telescope
Item No. penguin F300x76
76mm (3"), FL=300mm
details require sample
 
114mm/4.5"inch ball basement table telescope
Item No. Ball basement F500x114
114mm (4.5"), FL=500mm
details require sample
 
114mm/4.5"inch ball Dobsonian telescope
Item No. D150
150mm (6")
details require sample
 
114mm/4.5"inch ball Dobsonian telescope
Item No. D250
254mm (10")
details require sample
 
More Reflectors
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| terrestrial telescopes | equatorial telescopes | Bird/Jones telescopes | parabolic telescopes | large telescopes |
| Dobsonian telescopes | Newtonian telescopes |
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