Hi Omaroo,
I am using the DSI II CCD camera attached to the micro focuser but between the camera and the focuser is a 15mm extension and a f3.3 focal reducer/field flattener. the setup is MF-FR-Extension-DSI. This reduces my focal ratio to f3.3 from f10, I suspect this is why I get the wider field of view. My knowledge in this area is very limited though so I may also be wrong
If the are any members with a better understanding, please let me know.
cheers