RE: binocs

From: gacrowell (gacrowell@micron.com)
Date: Mon Jun 17 2002 - 11:05:17 EDT


One other question on this subject:  I have one eye that is so much worse
than the other that it is pretty useless with binoculars.  Any suggestions
for a good monocular?


> -----Original Message-----
> From: Matson, Robert [mailto:ROBERT.D.MATSON@saic.com]
> Sent: Saturday, June 15, 2002 7:04 PM
> To: 'SeeSat-L '
> Subject: RE: binocs
> 
> 
> Hi Linda,
> 
> Steve's binocular suggestions are all good.  I can add a few
> more suggestions.  If the binoculars you'll be buying will
> be used primarily at night, then you'll want to match up
> the size of the exit pupil with the diameter of your own
> dilated pupils.  Depending on your age, your pupils could
> be 8mm, 7mm, 6mm or less (getting smaller as you age).
> 
> To determine the exit pupil size for a pair of binoculars,
> divide the objective size in mm (the second number) by the
> magnification (the first number).  For example, 7 x 50
> binocs have an exit pupil of (50/7) or ~7 mm.
> 
> I use 8 x 56 binoculars made by Celestron -- it's just
> about optimal for satellite viewing.  A little more power
> than the 7 x 50's, but still relatively lightweight.  Beyond
> 8x, it's difficult to hold the image steady (though if you're
> willing to spend a lot of money, they do make image-stabilized
> binoculars).
> 

> Best,
> Rob
> 
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