Celestron Cheshire Eyepiece - 1.25" CPC High-quality primary and secondary mirror

High-quality primary and secondary mirror for maximum sharpness

Tube Diameter: 191mm

sharp visual light image is degraded by the addition of the infrared layer

The older ED81SII

This is most evident when working at high magnification and photographing using CCD photography with small pixel sizes

Celestron Cheshire Eyepiece - 1.25" CPC High-quality primary and secondary mirrorThe Cheshire Eyepiece is ideal a tool for collimating Newtonian telescopes, but is also helpful for adjusting Schmidt Cassegrains. These special eyepieces fit into the focuser tube of any 1. 25" eyepiece holder and are considered an essential part of your telescope maintenance kit for calibrating mirror telescopes. The Cheshire eyepiece has a crosshair in the center and is considered more accurate than a simple collimation aid. Whats included: x1