Sky-Watcher Cheshire Collimating Eyepiece

With this accessory you can adjust the optics of Newtonian and Schmidt-Cassegrain telescopes. It consists of a sleeve with crosshairs and a Cheshire eyepiece. The flexible eye cup ensures light cannot enter from the side.The collimating eyepiece fits into every 1.25” focuser or ...With this accessory you can adjust the optics of Newtonian and Schmidt-Cassegrain telescopes.

It consists of a sleeve with crosshairs and a Cheshire eyepiece. The flexible eye cup ensures light cannot enter from the side.The collimating eyepiece fits into every 1.25” focuser or alternatively every 2” focuser with the corresponding adapter. A small hole at the top and crosshairs at the bottom enable precise centring of the optical mirror components.

The polished surface with a 45° inclination projects a band of light into the optical path enabling precise primary mirror alignment.With this collimating eyepiece you can adjust any reflector telescope in just a few minutes. Anyone who owns a Dobsonian telescope that must always be transported to the observation site should own this accessory.