[Leica] binoculars - looking for assistance

[henningw at archiphoto.com (Henning Wulff)]

At 10:02 AM +1000 1/20/07, G Hopkinson wrote:
>Marc, I hadn't thought of that regarding our 
>pupil sizes as we get older. It sounds 
>plausible. However will not the larger diameter
>exit pupil allow for more latitude in 
>positioning your eyes against the eyepieces?
>Surely also, the brightness will vary? 
>Subjectively, binoculars with larger objectives 
>are much brighter and more comfortable to use
>to my older eyes.

Nope. Marc's quite right.

>Cheers
>Hoppy
>
>-----Original Message-----
>From: 
>lug-bounces+hoppyman=bigpond.net.au@leica-users.org 
>[mailto:lug-bounces+hoppyman=bigpond.net.au@leica-users.org] 
>On Behalf Of
>Marc James Small
>Sent: Saturday, 20 January 2007 09:26
>To: Leica Users Group; Leica Users Group
>Subject: Re: [Leica] binoculars - looking for assistance
>
>At 06:14 PM 1/19/2007, Don Dory wrote:
>  >Marc,
>  >I appreciate the clarification, but in general have more capability than 
> you
>  >can use is better than less.  When birding the over age dinosaurs seem to
>  >hide in dark thickets and deep inside fir tress and Magnolia's so I 
> thought
>  >a little over kill was a good thing.  :)
>
>Save that it does you no good at all.  If your
>eyes in dark conditions only open to 4mm, then an
>exit pupil larger than that is completely wasted
>and of new use:  the laws of physics forbid the
>cramming of a 7mm cone of light into a 4mm
>hole.  And to get that 7mm exit pupil, the camera
>has to be a lot heavier and larger than one with the smaller exit pupil.
>
>This is discussed regularly, as I noted, at both
>Better View Desired and on a number of astronomical lists.
>
>Marc
>
>
>msmall@aya.yale.edu
>Cha robh b?s fir gun ghr?s fir!


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