I am buying a 31mm Nagler eyepiece, to be used in a Celestron 11" EdgeHD. I have a Baader clicklock visual back and a 2" Televue diagonal that has a light path length of 3 ½". Should I attach the diagonal to the 1 ¾" long Baader clicklock, or a longer visual back to avoid possible vignetting problems? I know that for the 11" EdgeHD the ideal back focus distance is 5 3/4", but I understand this is important mainly for imaging, not visual.
Does anyone have experience using the 31mm Nagler eyepiece? Do you like it?