On 2006-06-07 18:21:14 -0400, "Bob" said:

Some folks say never get biger than 7x35 or 8x50 at the most.
Personally afer 1000s of hours staring through a pair i perfer 10x50. I
can just see so much more. Movement was never a problem for me.

10x50's are fine for daytime use, but are a bit hard to stabilize on a
small sailboat. 7x50's have a much larger aperture, 7mm vs. 5mm and
much more low-light capability, and are easier to hold stable. For
daytime use, I do carry a pair of Steiner 8x30s, which are considerably
smaller than the 7x50s I use at night. Also, the 7x50s have an
integrated compass, which is nice for taking bearings.