Andrew McCarthy(@AJamesMcCarthy):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.

Andrew McCarthy

@AJamesMcCarthy

Exploring the universe from a backyard in Arizona. Get my latest print 👇

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Andrew McCarthy@AJamesMcCarthy

2026.09.16 00:00

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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