I have a Meade LX200 10" ACF and meade 80mm APO with 2 inch fitting. I have been looking at the QHY9 and QHY11 mono camera's. I'm keen on the QHY11 for the FOV I would get, but worried about focus across the full field. I have both 0.63 and 0.33 reducers for the LX200 ACF.
There is a huge difference in phyical size between the two (18x13mm and 36x24mm). The QHY9 should be great for the 80mm APO. The 80mm certainly covers the 35mm area easily but I'm not sure about image curvature ?. I've been told the meade SCT's were designed for 35mm film before digital was around and the ACF should give a flatter field over the SCT, but I find it hard to get enough info on the web.