--- In amasot@y..., Richard Harding <rharding@i...> wrote:
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
A binoviewer should not make focus shift on an SCT any worse.
However, it might encourage you to use higher powers which does
make focus shift more annoying.
However, aftermarket C8 focusers should be reasonably cheap. Years
ago Tuthill sold a rack and pinion focuser for C8s that also
eliminated focus shift.
But I think you want all three: the N31, binoviewer and
focuser. You just have to decide what order you want them in.
Ah, the joy of toys.
-ad
ps. Mike is still winning. Time to catch up guys!
