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http://www.pas.rochester.edu/~cline/P235W/IsaacNewton-1689.jpg
Telescopes
A refracting telescope is a type of optical telescope that uses a lens as its objective to form an image. The refracting telescope design was originally used in spy glasses and for camera lenses.
http://static.howstuffworks.com/gif/telescope-basic.jpg
The Newtonian telescope is a type of reflecting telescope invented by the British scientist Sir Isaac Newton. He used a mirror and a flat diagonal secondary mirror. Newton’s first reflecting telescope was completed in 1668 and is the earliest known functional reflecting telescope.
http://en.wikipedia.org/wiki/File:NewtonsTelescopeReplica.jpg
The optical design of the Schmidt-Newton telescope combines elements from both the Schmidt camera and the Newtonian telescope. In this system the parabolic primary mirror common in newtonian reflector is replaced by a spherical mirror, which introduces spherical aberration. This is corrected by the Schmidt corrector plate, like that used in Schmidt-Cassegrain telescopes. From the Newtonian, it inherits the flat secondary mirror.
http://www.telescope-optics.net/images/43.PNG
A Dobsonian telescope is a telescope made by an astronomer John Dobson He created a low cost and portable telescope. The design is intended for visually observing deep sky objects. These telescopes are used for operating at low magnification. Dobsonians are popular in the amateur telescope making community, where the design was made and continues to get better and better.
http://www.flickr.com/photos/ambroseliao/2343871046/
The Schmidt-Cassegrain Telescope is a telescope that combines a cassegrain reflector's optical path with a Schmidt corrector plate to make a compact astronomical instrument that uses a simple round surface.
http://users.zoominternet.net/~matto/M.C.A.S/schmidt-cassegrain.gif
