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Amazon.com : Celestron Collimation Eyepiece 1.25" : Telescope Eyepieces : Electronics
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TS-Optics 1.25" metal Cheshire collimator for refractors and newtonians - Collimation - Telescope Accessories - Astronomy | MHzOutdoor
Cheshire eyepiece - Wikipedia
Collimation Tools - Sky & Telescope - Sky & Telescope
Collimation Tools: What You Need and What You Don't - Gary Seronik
