Question... I use a 2" diagonal on my SW120ed, but only 1.25 eps, with the 24pano being the longest focal lenght. I have very limited in focus, but would like to try one of the filter wheels from Orion for both planetary and DS filters. They push out the eyepiece by 20mm, meaning you need to go in 20mm, which I don't have...
So, if I just use a 1.25 diagonal, that pushes my focal point out, giving me the in focus I need... correct? and if so, am I vignetting the view? Also with this setup, the filter wheel could go before the diagonal.
(in case someone wants to ask why I only use 1.25, all my filters are 1.25, and they can be expensive to replace to 2", plus if using an f5 dob, that 24mm is big enough for me with an exit pupil... even though I know I can go larger with the refractor at f7.5)