With a 17.5mm backfocus, it’s tough to achieve the 55mm backfocus when trying to use a field rotator on either the ASI2600MM or ASI2600MC. With the camera, filter wheel or drawer, and a field rotator (e.g., Pegasus Astro Falcon Rotator) you end up over 55mm.
My only thought is to put the rotator between my refractor and the field flattener. Then I can still get 55mm on the other side of the flattener.
Anyone have another suggestion?
