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SOLD/EXPIRED WTB: NF 5.5-22X56 NPR1 Scope

We have the 5.5-22x50mm w/ the NPR1. I'm not a big fan of the 56mm.

Mike @ CSGW
 
I have a 5.5-22x56 with a np-r1 ret. and would take 1450 shipped it is three months old and is on my 6.5-284 right now can email pics
 
Finally figured out how to post pics here are a few
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Hmmm Why?

There is not a big advantage going to the 56mm.

The average size of a human's eye pupil at night is 7 mm and in daylight it is about 4mm on average. If the optic give you a 7mm of exit pupil and you are using it for day use more than half the light will not reach the retina. I have also noticed if you are getting too much light and you look away you see light spots were ever you look and the targets look washedout. On a lot of my scopes I use a light reducer so I do not get the light spots and the washout is not there.

Size of bell divided by magnification = exitpupil. Hare are some examples.
56/22x=2.54mm
56/5.5x=10.18mm
50/22x=2.27mm
50/5.5x=9.09mm
The sweet spots for the 56 and the 50mm at Night and Day use.
50/7.14x = 7mm night use and for day use 50/12.5x = 4mm
56/8x = 7mm night use and for day use 56/14x = 4mm
You are really not getting much advantage over the 50mm. I feel there is a bigger disadvantage and that is you have to go with tall rings 1.00" at the low to 1.25" were the 50mm you can do 0.885".

Mike @ CSGW
 
Thanks for the info CS. Very informative read.

I just bought a NF from Nddodd. I am looking for another NF and will look into the 50mm.
 

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