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Collimating a reflactor

21 Mar 2017, 01:00 UTC
Collimating a reflactor
(200 words excerpt, click title or image to see full post)

One of the nice things about ‘reflactors’, like the ones shown here, is that they can be collimated just like reflectors – and at the fast focal ratios that reflactors typically work at, they’re likely to need it.
I don’t think I’ve ever blogged about collimation before. I haven’t blogged about how to do it because there are so many other sites that cover it already. I learned it myself from the book Astronomy Hacks by Robert Bruce Thompson and Barbara Fritchman Thompson, which is a pretty good book for anyone getting started with a telescope, and an absolute gold mine for anyone who owns a reflector. The Thompsons have nice step-by-step instructions, illustrated with photos, for making and using your own collimation cap, and for collimating using the Barlowed laser method.
Collimation is one of those things that seems forbiddingly complex until you’ve done it a couple of times, at which point it becomes so routine as to hardly be worth mentioning. In conversation with other amateur astronomers I usually compare it to changing a baby’s diaper – awkward and probably terrifying the first time or two, and a complete non-event the next thousand or so times.

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