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10 Top Telescope Questions
by Ed Ting

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looking down the tube
Reflecting telescopes periodically need adjustment for optimal viewing.
S&T: Craig Michael Utter
9. Can you help me collimate my telescope?

Owners of reflectors and Schmidt-Cassegrains periodically need to collimate (align) their optics to get the best images. Unfortunately, collimation is one of those things that’s much easier to do than to describe without the benefit of step-by-step pictures. But why reinvent the wheel here? An excellent, well-illustrated article on the subject has already been written by Nils Olof Carlin.

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