1.25" Refractor Collimating Eyepiece
Used for checking and adjusting collimation of refractor telescopes.
Angled reflecting surface introduces light into the optical path.
Fits in 1.25" focusers and adapters. Fold down eyecup.
Here's a great reference for refractor collimation, including using
this collimating eyepiece: COLLIMATING YOUR REFRACTOR:
Prices include shipping in the USA!