I just picked up a GSO Ritchey Chretien 10". While i'm waiting on a focuser and a few other things. I tried doing some research on the back focus for one of these. I have always been using Refractors and the Ritchey Chretien are a different beast altogether. Anyway It came with 3 spacers, 2" & 2ea 1" Anyway the 2 camera set's that I will be using are the QHY600 Mono with filter wheel, and a ZWO Asi6200MC with filter tray. Normally I will be using a 55mm backfocus with these camera on my Esprit 120. However from my understanding the back focus on an RC is much further away and I am unable to find any kind of documentation that tells me what it should be and where it is measured from on the back of the scope.
So on that note, is there anyone using a GSO RC 10" (Truss) than can help me out. How many and which spacers are you using and what should be back focus be along with where you are measuring it from.
Any help would be greatly appreciated and would probably save me a couple of nights of trial and error. I would rather have 1 night instead of many to get it dialed in.
Also, I've done a search here and have come up short.