Andrew McCarthy
@AJamesMcCarthy
Exploring the universe from a backyard in Arizona. Get my latest print 👇
加入 May 2014
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A sight familiar to most astrophotographers!
By pointing the instrument at a star and defocusing it, we can check the tilt of the mirrors and adjust them. This is called “collimation” and allows us to ensure the primary and secondary mirrors are precisely aligned.
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