Baader Alan Gee corrector for C8?

[Mickconn77 (Mick)]

In the market for a decent corrector as the 0.63 celestron is woeful. The aforementioned FR has stellar reviews however I have queries about using it with a long image train and also wouldn’t mind chatting to someone that actually has one.
My image train is
Zwo1600mm-efw-tilt adapter-oag-visual
Back-C8 SCT.

[floyd_2 (Dean)]

Out of interest, what back focus are you using from the back of the reducer to your chip? There seems to be 2 schools on the correct distance. One being 85mm, and the other being 105mm. On my C9.25 I’m using 85mm and the results are great to the edge using a Sony A6000 (6000x4000px) as my camera.

Also, where in your image train is the reducer, as you didn’t specifically mention it with respect to your image train layout. You probably have it all spot on, but just in case there’s a problem there.

[Mickconn77 (Mick)]

Originally Posted by floyd_2

Out of interest, what back focus are you using from the back of the reducer to your chip? There seems to be 2 schools on the correct distance. One being 85mm, and the other being 105mm. On my C9.25 I’m using 85mm and the results are great to the edge using a Sony A6000 (6000x4000px) as my camera.

Also, where in your image train is the reducer, as you didn’t specifically mention it with respect to your image train layout. You probably have it all spot on, but just in case there’s a problem there.

Thanks so much for your reply. Reducer is just after the OTA. I think I need to shorted the back focus as you said, I’ve since removed the oag to get it to 80mm and do test subs from there. Still waiting on adapters to fix the reducer to the image train instead of the visual back.
I’ve got a strong suspicion mine is the 85mm variety.