"Mike Jenkins" wrote in message
thlink.net...
Greetings,

About 6 weeks ago I purchased a pair of Leupold 10x50 binocs. This means
that these binocs have an exit pupil of 5. Right? The problem with these
is
the field of view is smaller than what I'd like.

Yep.

Will the 7x50's and the 8x56's have too large of an exit pupil. My
thinking
is for astronomy, the more light the better. Is this thinking correct?.
How
will having too large of an exit pupil affect my astronomy observing? I
know the 7x50's and the 8x56's have an exit pupil of 7.1 and 7. Is this
too
large an exit pupil?


The more light that reaches your retina the better. Unfortunately, an exit
pupil that exceeds your eyes pupil doesn't do that, it actually will cause
contrast and brightness to suffer. That being said, its still a matter of
personal choice. Of course contrast is largely an issue with DSO's, many of
which are just plain unappealing in 50-60mm low-power binos.

Of course if your eyes are only dialating to 4-5mm, you are only able to use
50% or so of the light available from a 7mm exit pupil. (Which of course
means your going to be getting the equivalent of 7x35s out of your 7x50s.)

Anyways, good luck.