The Celestron Cheshire Collimation Eyepiece is ideal for precise collimation of Newtonians and helpful for aligning Schmidt-Cassegrains. This special eyepiece fits into 1 focusers or diagonals. Alignment is easy using the small opening on one end and thin cross hairs at the other end. The collimatio... more details $29.99 at eHobbiesReview this merchant
Celestron's color filters are mounted in black anodized aluminum cells with the Kodak Wratten Series Number individually engraved. The cells of each filter are double-threaded, so they can be stacked (piggybacked) in various combinations. This allows you to create different color combinations and tr... more details $34.99 at eHobbiesReview this merchant
Celestron's color filters are mounted in black anodized aluminum cells with the Kodak Wratten Series Number individually engraved. The cells of each filter are double-threaded, so they can be stacked (piggybacked) in various combinations. This allows you to create different color combinations and tr... more details $34.99 at eHobbiesReview this merchant