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| Terms / Dobsonian Telescope | |
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| A conventional Newtonian reflector optical tube on an inexpensive plywood or fiberboard altazimuth mount. Nylon or Teflon bearings allow smooth telescope motion at a finger's touch, with no vibration or unsteadiness. The scope is moved by hand from object to object (there are no manual slow motion controls or motor drives) using a technique called star-hopping to locate objects. Usually it's a large aperture, fast focal ratio scope designed for visual deep space observing - although 6" and 8" medium f/ratio Dobsonians also suitable for planetary observing are becoming increasingly popular. Cannot be used for astrophotography. The Dobsonian is an economical way to get into large aperture astronomy at a fraction of the cost of an equatorially-mounted scope. |
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