I have read all of the posts here about back focus and the Celestron OAG. I'm trying to set up my first OAG on my Edge 8 (or any other scope for that matter). So, I have no idea what I am doing. I decided to use a Celestron OAG due to the mirror size and the fact that it's seems to be designed with Celestron products in mind.
I put together the following in the imaging train.: .7 reducer, the OAG, Starizona filter drawer and an ASI 294 MC. the guiding camera is an ASI 290.
I have done a direct measurement from the lip on the reducer back to 6.5 mm from the front of the camera. It measures (as best I can) 105mm. Using Sharpcap during the daylight on a cell tower a mile or so away, both the primary and guiding camera focus. I haven't tried it at night yet.
I have included a picture of the imaging train.
Hoping for a few comments and opinions.....
Edited by SandyC8, 13 April 2021 - 11:03 AM.