Steve, you're using a standard 2" diagona Also, I like that BLUE tube!
Yes - standard 2" mirror diagonal is shown in the pick. I also use a Celestron 1-1/4" prism, which requires a bunch of outward focus. Both diagonals will bring all of my eyepieces to focus.
Its got to be the difference in focal length. I tried my 1.25 Celestron mirror diagonal and the 2" diagonal. Neither will allow my 4mm Burgess or the 5mm come to focus. I can focus them very close, like across the yard. But no further.
Edited by rnc39560, 22 August 2014 - 10:40 PM.