Don't mean to beat a dead horse to death, but need some advice for a beginner. I have a
Celestron Evo 8" SCT. I purchased an ASI224MC to use for lunar imaging. Do I need to concern
myself with back focus for lunar imaging? I have gotten ambiguous answers with different answers. Some say use your diagonal. Some say insert into visual back and that's all you need. Another says I need 132mm.
So what do I really need? I have a William Optics roto lock visual back that gives me 70mm to front face of camera + 12.5mm to sensor = 82.5. Do I add a 50mm extension? Also, I have a UV/IR cut filter (1.25") that attaches to the nosepiece that came with the camera. If I attach the extension to the camera, how can I get this filter in the optical train since I can't attach it to the camera and the extension wont accept a 1.25" filter? Any help is most appreciated. I am totally new to this with nobody to guide me. Tnx Ted
