what Rings ?

Discussion in 'Long Range Scopes and Other Optics' started by randeiam, Dec 16, 2008.

  1. randeiam

    randeiam Member

    Messages:
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    Joined:
    Dec 14, 2008
    looking at buying my first nightforce, a 5.5-22x56 what size rings do i need for a strait taper barrel?
     
  2. CS T

    CS T Official LRH Sponsor

    Messages:
    1,248
    Joined:
    Jun 8, 2004
    You can go with rings that have a center height of 1.0”. I would recommend going with the 50mm over the 56mm.

    Here is some info:
    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