https://www.gigoptix.com/how-do-i-collimate-my-newtonian-telescope/
How do I collimate my Newtonian telescope – aligning the mirrors in daylight? - GigOptix
Jul 12, 2020 - For a refractive telescope, Collimation is crucial. Collimation enables you to get the best out of your Telescope. The Newtonian Telescope is designed to...
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