Some fantastic rig Mike
I hope you will be very soon collecting top quality cosmic data again
Greg - you are too kind but thank you for such nice feedback. I'm eagerly awaiting winter to hopefully do one or two as deep images as my 4" allows. It might be worthwhile checking with Catalin, but I think the 105mm CFF can handle up to KAI 11000 with its dedicated 3.2" field flattener that threads directly to 3.2" FTF. I may be wrong, but there is only one 4" that can properly accommodate KAF16803, and it is the FSQ106 - an ultimate 4" astrograph.
I would love one day to upgrade my camera to something with KAF16200, as this sensor would definitely be a very nice match with my CFF in terms of speed, field of view and sampling.
Sorry Mike, I got sidetracked.