Farpoint Primary Mirror Center Marking Kit LARGE — 12" to 26"The Farpoint Primary Mirror Center Marking Kit with LARGE template designed for big Newtonian and Dobsonian primary mirrors from 12" to 26" diameter. Everything you need to accurately mark the center of your large primary mirror for precise collimation. Why Center Marking Matters Accurate collimation depends on knowing exactly where the center of your primary mirror is. Without a proper center mark, your laser collimator and Cheshire eyepiece have no