Thanks for this Mike. I am not 100 % sure about the focusing questions, but enough to know that it will probably lead to a hassle at the eyepiece. I have enough problem with focus shift on the C-8 without adding more problems with these binoviewers! I know that Todd may think that $500 to $600 is a bargain, but this is the price of a 31 Nagler!! I think I'll pass and buy the Crayford focuser for my C-8 to take the mirror shift out of the formula instead ;o)
Richard
