[Leica] binoculars - looking for assistance

[hoppyman at bigpond.net.au (G Hopkinson)]

Henning, nope to the ability to position your 4 mm pupils within the 7 mm or 
larger disc more easily or nope to the image being
brighter (better light gathering)?
Empirically, I have modest Nikon binoculars on hand, one set with 20mm 
objectives (dach prism) model and one with 50mm objectives.
I'm aware of the relationship between the magnification and objective size. 
Also the differences in lens design/quality. The larger
set is much easier to view through and show more detail in low light to my 
perception. No contest. My experience in the past with
telescopic sights has been similar. You've piqued my curiosity now. 

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
Henning Wulff
Sent: Saturday, 20 January 2007 10:21
To: Leica Users Group
Subject: RE: [Leica] binoculars - looking for assistance

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!