Stereo Binocular ViewerBinoviewers improve views dramatically, producing a three dimensional effect that youll love! Using two eyes for observing instead of one lets you see more detail, reduces eye fatigue, and increases contrast For use with catadioptric telescopes and other telescopes with sufficient back focus Includes an aluminum carry case with foam lined interior Requires a matching pair of 1. 25 eyepieces, sold separately Features Add the Celestron Stereo Binocular