Which telescopes is this Starlight Instruments 2.0" adapter designed for?
This adapter is specifically designed for Celestron and Meade fork-mounted Schmidt-Cassegrain (SCT) and Maksutov-Cassegrain telescopes that use a standard 2"-24tpi rear cell thread for accessories.
I have a Celestron 8" SCT on a fork mount. Will this adapter let me install a 2.0" Feather Touch focuser?
Yes, this adapter is made for exactly that purpose. It will thread onto the 2"-24tpi rear cell of your 8" SCT, providing the correct interface to mount a 2.0" Feather Touch focuser.
Why should I replace my SCT's stock focuser using this Starlight Instruments 2.0" adapter?
The primary reason is to eliminate image shift. Stock SCT focusers move the primary mirror, which can cause the image to shift during focusing. An external focuser like the Feather Touch, mounted via this adapter, provides much finer, more stable control that is critical for high-magnification visual use and astrophotography.
What is the thread size on this Starlight Instruments 2.0" adapter?
This adapter features a female 2.0"-24tpi (threads per inch) thread. This is the standard size for the large visual back on most commercial SCTs.
Will this adapter work on a non-fork-mounted Celestron EdgeHD 11"?
While the 2"-24tpi thread is the same, this adapter is specifically listed for fork-mounted models, which can have different clearance requirements. Starlight Instruments offers a range of adapters, and you should confirm you are selecting the correct one for your specific telescope model and mount combination.
Does using the Starlight Instruments 2.0" adapter affect my telescope's back focus?
Yes, any adapter adds length to the optical path. While this adapter is designed to be as compact as possible, you will need to account for its length, plus the length of the new focuser, when calculating the remaining back focus for your imaging train.
