- Chesire collimation eyepiece – the classical collimation tool for Newtonians and Refractors
- Collimating your refractor is quick and easy when you use this 1.25″ Cheshire collimating eyepiece.
To use this eyepiece, simply cap the telescope, remove the diagonal, and place the eyepiece directly in the focuser. Use natural daylight or shine a flashlight into the side opening with the 45-deg angled silver plate. Look into the small opening at the top of the eyepiece. You will see one or more small faint circles (usually overlapping) near the center. Adjust the objective cell’s push-pull bolts until the small circles merge into one. Thats it! With precise collimation, your refractor telescope will deliver the best image it can.
At Newtonian telescopes, the reflected images of main- and secondary mirror must be exactly concentric. Due to the centric viewing position, this can be achieved without errors.