How to Align Your Newtonian Reflector Telescope | Sky & Telescope - Sky & Telescope
tips please on how to check my focuser is in my refractor straight using a laser - Getting Started Equipment Help and Advice - Stargazers Lounge
How to collimate your telescope
A Beginner's Guide to Collimation - Gary Seronik
Refractor collimation check with a Cheshire EP - Discussions - Scopes / Whole setups - Stargazers Lounge
1.25" Cheshire Collimating Eyepiece with Crosshair for Newtonian Refractor Astronomic Telescopes Monocular Telescope Accessory - AliExpress
ES Refractor Collimation Questions - Refractors - Cloudy Nights
Explore Scientific Tips: How to Collimate a Refractor | Here we are in the Explore Scientific QA room where we collimate each and every Explore Scientific telescope before it leaves our facility.