I have a Skywatcher 120ED fitted with either a 1:1 flattener or a 0.77. In may image train are a ZWO OAG-L, a ZWO 2" filter wheel and a ZWO ASI 2600MC. Do I have enough backspace to fit the ZWO CAA?
78R7IG2R No, or you may consider to install the CAA infront of the flattener.
