Sunday, August 24, 2014

confirmed AstroMaster 114 design

Researched the Celestron AstroMaster 114 "Newtonian" telescope. Confirmed what I learned from the weekend. It is a compound telescope. Some call it the Bird-Jones variant of a Newtonian. In the end, it is catadioptric, a telescope that uses both mirrors and lenses to form an image for the eyepiece.

I found a fascinating video by Calan Roupe, about 30 minutes long, where he showed how to effectively collimate the AstroMaster 114 with a laser collimator. It first requires removing the corrector lens from the bottom of the eyepiece tube! It's a handsome piece of glass—looks to be about 1 cm thick. Alignment is important—should be indexed before removal. Not terrible easy to do in the field...

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