Subj : EYES ?
To   : Jean Parrot
From : Howie Coombe
Date : Mon Nov 08 2004 07:59 pm

Dear Jean, in regards to this message to Max Chamberlain.

 >  Hello Max,


G'day Max, G'day Jean.

 > we were saying !


A Bit.
 
 > MC> usually can't resist trying to improve the focus anyway. Invariably I 

 >  Right.


Indeed.

 > But you seem to be doing as best as you can with what is at hand.


Absolutely.

 > Another aspect of this is the size of the exit pupil.


How so?.

 > 5mm is the normal daylight size of the human pupil and any binocular whose   
> specs division is less than 5 is overkill.


Aha.

 > 7 x 35, 8 x 40 and all.


OK.

 > See?


Gotcha.

 > It makes it harder to center your eye over the actualll window offered by    
> the optics.


I Can imagine.

 > In your case,


Yes?.

 > you get a 7.14 exit pupil and this would be valuable at night when you       
> accomodate for poor lighting conditions.


Roger that.
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