New William Optics 2” Rotolock eyepiece adapter/visual back (with 3.28"(female) thread).This WO adapter has a female 3.28” thread  on one side, and a standard 2” visual back on the other side; threaded for 48mm Filters.Just rotate the adapter ring clockwise to lock any inserted accessory, or counter-clockwise to release the accessory. Innovative design ensures that you get a very solid hold and the accessory is perfectly centered every time. No thumbscrews to worry about! The internal ball bearings and detents make this adapter a joy to use.

Schmidt Cassegrain Telescopes

- Fits the 3.25" SCT thread on large SCTs (Celestron 11-14" and Meade 10-14" telescopes) to give a full 2" clear aperture.
- Not for use with smaller SCT telescopes up to 9.25" aperture. For those scopes, please see D-ROTO-A2-SCT2F (SCT2" RotoLock adapter(2"-SCT2").