When I set up my ED127 with focal reducer, I used the 952 focal length, with 3.8 CCD pixel and used the formula to set my arc-sec/pixel at .82 I did not account for the focal reducer however, and everything seems to work fine.
Now I am about to set up my SV70T which has a 420mm focal length. But with the reducer, it goes to 2.33 arc-secs/pixel. Now I am wondering, which one do I actually use when setting the equipment profile?
In fact Plate Solve works fine on the 127 profile (maybe a tad long as it goes through 6 attempts with 60 pixels of error). So how much does it really change when adjusting for reducer/flattners?