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MOBIRDS-L  April 2008, Week 1

MOBIRDS-L April 2008, Week 1

Subject:

Re: binos, "twilight factor"

From:

Robert Fisher <[log in to unmask]>

Reply-To:

Robert Fisher <[log in to unmask]>

Date:

Sat, 5 Apr 2008 12:42:44 -0500

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (64 lines)

Gail:

I'm not familiar with the expression, "twilight factor," but there are 
several factors that determine a binocular's light transmission -- i.e. how 
much light reaches the eye. The diameter of the objective lens (large lens 
farthest from the eye) determines how much light enters the binocular. The 
larger the objective lens, the more light gets in. The shape and quality of 
the glass, coatings and construction of the binocular then determine what 
happens to that light between the time it passes through the objective lens 
and the time it reaches the eye.

How "bright" the image appears in low light may depend upon more than how 
much light is getting in. For example, if the resolution, contrast and/or 
color fidelity are better, you will see more detail, and that will create 
the impression that there is more light with which to see the object. 
Conversely, anything that interferes with resolution, contrast and/or color 
fidelity may create the impression that there is not enough light to see the 
object well.


The relationship between the size of the objective lens and the 
magnification of the binocular yields a factor by which you can calculate 
the exit pupil and that, in turn, may have some effect on how the binocular 
appears to be performing in low light. That factor is equal to the objective 
(large) lens divided by the magnification. Thus, 7 x 35, 8 x 40 and 10 x 50 
all have the same factor --- i.e. 5, and the exit pupil is 5mm. 10 x 40s 
have a factor of 4 and the exit pupil is 4mm. The smaller the factor, the 
darker the image will appear, all other things being equal, but the 
difference is noticeable only in marginal light conmditions. For example, 
although the diameter of the objective lens does not change, anyone who has 
used a scope at twilight knows that the image appears brightest at 20x and 
can seem hopelessly dark when cranked up to 60X.

Still another factor is hand shake. The effect of hand shake is 25% greater 
with 10 X 40 binoculars than it is with 8 X 40's. Anything that blurs detail 
can create the impression that there is insufficient light to see detail.

For the time being, the Swarovski EL 10 X 42 and 8.5 X 42 are the Mercedes 
Benz's of binoculars --  i.e. they are very much in vogue among hot shot 
birders. (20 years ago,  everyone had to have a Zeiss 10 x 40). Whether they 
are still better than the latest competition may be debatable, but most will 
agree that they are superb binoculars. You can't go wrong with those models 
of that brand.

You may go wrong choosing the 10 X 42 EL over the 8.5 X42 EL because it 
looks better in Bass Pro or Cabela's. It is easy to prefer the higher 
magnification in a store, then wish you had the lower magnification and 
wider field of view when trying to get on a fast moving warbler in a forest. 
I bird with a guy who carries Swarovski 10 X 42 EL's and a cheaper pair of 
Bushnell 10 x 42's simultaneously. He uses the higher powered Swarovskis 
while sitting in the car, but I think he uses the Bushnell more often when 
walking around. I strongly advise that you try both in the field before 
making a $1900 choice that may be the wrong one for you.

If you want to know who will let you try them out, contact me off list.


Bob Fisher
Independence, Missouri
[log in to unmask] 

------------------------------------------------------------
The Audubon Society of Missouri's Wild Bird Discussion Forum
List archives: https://po.missouri.edu/archives/mobirds-l.html

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