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Hi Paul,
I have an AOL, ST11K, MOAG, RGH etc, even have a 10"RC and a PMX, sound familiar?
Recently I have run into back focus issues with the RC10C, with this scope you have to get as close to the optimal 6" back focus as possible or the stars at the edge of the (quite large) ST11k chip are not round. So I have had to forgo the MOAG/RGH and use the internal guide chip. Sometime you get lucky and there's a nice guide star in the field somewhere, though it can limit the framing of the object somewhat. I also used to have a rotator, that went too in search of back focus.
AO is essential IMHO for long focal length imaging, even with the best mount available, AO works and makes imaging so much easier, just use it any way you can. You can get away with longer guiding images on the colour subs, but try to get 5-15Hz for the luminance, it helps to really bring out the best in your imaging system.
I have the MOAG/RGH and adapters sitting in a box in the obs at the moment, I was going to sell it, but am keeping it for a little while just incase I can fit it in somehow. You're welcome to borrow it if you want to try it out, just PM me and I'll arrange to have it posted over.
Cheers
Stuart
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