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.
Takahashi Collimating scope for Ritchey-Chrétiens, Dall-Kirkhams, and refractors | Astronomics.com
Triplet refractor collimation and lens centering - ATM, Optics and DIY Forum - Cloudy Nights
Amazon.com : Almencla '' Collimation Eyepiece for Refracting Refractor Telescope Short : Electronics