Astro-Physics 2" Visual Back for Celestron 11" & 14" SCT

This 2-inch Visual Back threads onto the rear cell of Celestron 11-inch to 14-inch SCTs with 3.29-inch male threads on the telescope's rear cell. It provides a full 2-inches of unobstructed opening (unlike most visual backs). Use the AP 2-inch Celestron Large Rear Cell Adapter with 2-inch accessories that slip in, such as a 2-inch diagonal, Barlow, 2-inch eyepiece, or binocular viewer. This visual back features AP's unique brass locking ring design and 3 large thumbscrews to hold your accessories securely and squarely; ideal for critical applications. If you prefer to use just one thumbscrew on occasion (perhaps if you are interchanging light accessories frequently), simply remove the extra 2 thumbscrews for that session. Note: Celestron EdgeHD scopes have a restricted rear cell that may not allow accessories with a long nosepiece to fully seat in this adapter (the AP Maxbright diagonal will not seat). It is recommended to choose the ADASCTLC27 and ADA2003 (or ADA20132) as an alternat