TS Optics 1.25" Cheshire collimatíng eyepiece for refractors and Newtonians
Collimating your refractor telescope is quick and easy when you use this 1.25" Cheshire collimating eyepiece. You see in seconds the collimating situation of the telescope, you also can use the Cheshire on Newtonian telescopes.
To use this eyepiece, simply cap the telescope, remove the diagonal, and place the eyepiece directly in the focuser. Check that your focuser is aligned properly with your telescope tube. 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.
This item can only be used if your refractor telescope cell has a push-pull or other mechanism to adjust the lens elements. It will be of no use with fixed cell objectives that cannot be adjusted. But you can see, how good or bad your objective is collimated.
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.
1.25" Cheshire collimation eyepiece
With this collimation eyepiece you see in seconds the collimating situation of the telescope