[ap-gto] Which Camera?
I have a ZWO ASI6200C with ZWO off-axis guider. The off axis guider has some design deficiencies imo. The off axis mirror/guider housing is 1 unit and cannot be locked firmly into the body of the OAG and hence some flexure is possible. Despite tightening the lockscrew as much as I dare you can still move the guide camera sideways relative to the OAG body.
I also have a QHY600M with QHY filter wheel and QHY OAG. Quality of construction is better imo. The OAG is well designed. The guide camera housing is built into the body of the OAG and the off axis mirror moves as a sub assembly in the body of the OAG. Also the QHY has a helical focusser built in, where it's an option on the ZWO. Albeit the QHY is more expensive.
Re camera differences , I like the fact that the power cable has a lock screw on the QHY, also I believe there are internal and chip grade differences in comparative cameras. I have found issues with the USB cables supplied with the QHY, had some strange download issues and had a sequence stopped for no reason on 2 occassions and camera disconnect with NINA. I replaced with aftermarket quality cables and have had no further issues.
I have attached my latest project QHY 600M , Astrodome filters, Tak 105FSQ. Needs more work only curves using masks to date. But you will no doubt be aware of many superb images taken with the QHY600M.
Regards Luke Dodd