Can anybody else double-check a calculation/measurement I have from the back of the EdgeHD 1100's baffle lock nut down to the edge of the OAG's 48mm threads?
I've calculating / measured that the combined backfocus consumption of the OAG and 3.25"/2" adapter is 91 mm.
Does that sound right?
That includes the width of the 3.25" to 2" adapter, and the OAG itself up to (but not including) the 48mm threads. Since the next element of the optical train will consume those threads.
This also includes the fact that the OAG sticks around 2.5mm out from behind the adapter's 2" threads and doesn't go flush against it.