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August 16, 2006, 10:25 AM | #1 | |
Junior member
Join Date: November 12, 2004
Posts: 449
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What the numbers on your scope mean.
I don't remember where I copied this. But it's a pretty good breakdown of riflescope nomenclature.
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August 16, 2006, 03:38 PM | #2 | |
Junior member
Join Date: May 31, 2004
Location: The Toll Road State, U.S.A.
Posts: 12,451
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Thanks for the excellent info.
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August 25, 2006, 04:49 PM | #3 |
Junior Member
Join Date: August 25, 2006
Location: Oak Grove, KY
Posts: 1
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Is there any analogy between the exit pupil size and the light transmission percentage of the scope? IOW, if the scope is not transmitting 100% of the available light through the scope-which I don't think is possible-does having a larger exit pupil diameter have any effect on the perceived brightness of the scope?
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August 30, 2006, 04:49 PM | #4 |
Senior Member
Join Date: March 13, 2006
Posts: 166
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Yes. Let's assume that the lenses in a scope will transmit all light they receive.
The 'maximum usable' exit pupil is 7mm. But the exit pupil is calculated by finding the ratio of the scope's fron lens size to the magnification of the scope. So a 1X scope would really only need a 7mm lens in front. That isn't particularly practical, but you get the point. If you wanted a 40X scope with all the light you could use, you would need a lens of 280mm. It sure would look funny Next time you are at a gun store, ask to see a 6-24 or an 8-32 variable scope. Turning the dial, and looking at a dim corner, you should be able to see the scope picture getting dimmer as you increase power. |
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