Thanks for all the comments. I grabbed a Celestron OAG. It is a beast and very well made. Focuser is great. It also is able to fully rotate at both ends (camera and scope) so you can ensure the prism is sitting on the long side of the sensor, thus reducing and instrusion into the field and basically set it up how it suits you. Yes it is a back focus hog. My scope with the 0.7 reducer needs 105mm of BF and the litecrawler focuser, OAG, Filter wheel and camera are using about 114!! Unfortunately I have to put a 6mm extension between the focuser and the OAG otherwise the OAG focuser is righ up against the main focuser body. If not for that it would be at 108mm. Have taken a few test shots. Stars appear reasonably tight but I think there is some curvature there. Oh well
