Long Range Hunting Online Magazine


Go Back   Long Range Hunting Online Magazine > Rifles, Reloading, Optics, Equipment > Long Range Scopes and Other Optics

Long Range Scopes and Other Optics Nightforce Optics


Reply

50 or 56mm Nightforce

 
LinkBack Thread Tools Display Modes
  #8  
Old 10-12-2007, 12:02 AM
Platinum Member
 
Join Date: May 2001
Location: Sask. Canada
Posts: 2,410
In my experience the 50 and 56 mm scopes definitely require different ring heights and Badger Ord makes rings optimized for each type. The determining factor is the contour of your barrel below the bell or objective of the scope. Barrels with minimal taper require taller rings with the 56's, otherwise they rest on the barrel. Been there. If your barrel tapers relatively quickly you would probably be OK but my #7's and M24 contour barrels do not like 56mm NXS scopes with standard rings.
Reply With Quote
  #9  
Old 10-12-2007, 08:02 AM
Gold Member
 
Join Date: Dec 2006
Location: FREE RUN, MS
Posts: 774
I read an article once about 50 or bigger objective scopes...seems they were saying that our eyes(rods cones) CANT use the light provided by larger scope objectives once they change over into our night vision mode.

I read that a long time ago and wish I knew where Id like to re read it.

But I wil tell you what I think of a 50 NXS tonight.

Optics usher light to your eye
The human eye is wonderfully designed to gather more, or less, light as conditions around you change. Even state-of-the-art optics can't compete with the ability of your eye's iris to control the pupil size, which acts much like a variable aperture for the retina. The aperture for a binocular, spotting scope or monocular is fixed and limits the amount of light gathered through an optical lens. This is why it's important that you select a model that provides the amount of light you need to view as conditions grow darker.

How your eye responds to light
The eye pupil can change in size from about 2mm in bright light to up to 8mm in low light. As you grow older, the ability of your eye pupil to dilate slowly decreases. For example, most eyes dilate to about 7mm or 8mm at age 20, but by the time you reach 50 your eyes may only dilate to around 5mm. Keep in mind that hereditary and environmental factors may also affect how much your eye dilates at various stages in life.

How the exit pupil affects viewing
The exit pupil is an indicator as to how well you will see an image on a bright day, at twilight or at night. Knowing the exit pupil can help you choose a binocular that is well-suited to the light conditions you are viewing in.

Exit Pupil = Objective Lens Diameter divided by Magnification
The exit pupil is the magnified image in the eyepiece as it leaves the binocular to enter your eye. You can actually see the exit pupil of a binocular, monocular or spotting scope as a circular beam of light when you look at the eyepiece from arm's length.

2mm to 3mm for viewing in bright light conditions.
4mm to 6mm for observing at most any time of the day.
6mm to 8mm for viewing in the darkest conditions.
When the exit pupil is smaller than the pupil of your eye, the amount of light falling on the retina will be less than what you could really use — and the image appears less clear and dimmer. When the exit pupil of the binocular is larger than the pupil of your eye, some of the light coming through the binocular will fall on the iris where it doesn't get used at all (follow the path of the 5mm exit pupil in the diagram above). However, if you find yourself boating a lot, you may find it easier to keep your eye centered in the larger 7.1mm exit pupil of a 7x50 binocular.


This is not the article I was refering to but covers it pretty well.
__________________
MEMBER "AM STRIKEFORCE"

Last edited by NYLES; 10-12-2007 at 08:53 AM.
Reply With Quote
  #10  
Old 10-13-2007, 05:50 PM
Bronze Member
 
Join Date: Dec 2005
Location: KS
Posts: 76
Short answer...I have 3 NF NXS and 1 of them is in 50. If I could do it over it would be a 56. ;)
__________________
Act as though you were to live forever and live as though you were to die tomorrow
Reply With Quote
  #11  
Old 10-13-2007, 10:31 PM
Silver Member
 
Join Date: Aug 2006
Location: Hatchet City, AB,Canada
Posts: 232
I'll be running Near Mfg rings and rail on the Parker Hale.. It has a Varmint weight barrel....

Bill
__________________
Blygy
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes


Similar Threads for: 50 or 56mm Nightforce
Thread Thread Starter Forum Replies Last Post
Nightforce 56mm -vs- 50 mm 700man Long Range Scopes and Other Optics 5 02-18-2011 10:06 PM
NIB Nightforce 3.5x15x50 and 56mm NPR 1 casscad Optics For Sale 2 11-04-2010 08:58 AM
FS: Nightforce NXS 5.5-22X-56mm David P. Herne Guns For Sale 4 10-23-2004 09:53 PM
nightforce 8-40 x 56mm Benchrest? reed mosser Long Range Scopes and Other Optics 2 05-30-2004 08:45 PM
Nightforce NXS 5.5-22 X 56mm sbrown Guns For Sale 5 10-24-2003 12:50 PM


All times are GMT -5. The time now is 06:49 AM.


Powered by vBulletin ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Management Powered by vBadvanced CMPS
All content ©2010-2014 Long Range Hunting, LLC