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Leupold RED

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/19/2013 at 19:43
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Anyone know why Leupold uses red for reticle illumination? I have scope 67970. It is a great
scope but I would have preferred a green illumination. I knew this when I bought it and would
not have changed my decision but was just wondering if anyone had a thought.  Pete
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/19/2013 at 19:49
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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/19/2013 at 20:12
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IDK, but maybe it has to do with some colorblind people having trouble with green?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/19/2013 at 21:02
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The human eye dilates less to red light than it will to green light. This is why red lights are used to acclimate the eyes for darkness. The illuminated scopes are to see the reticle in low light, where you do not want to harm your night vision.
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Originally posted by 3_tens 3_tens wrote:

The human eye dilates less to red light than it will to green light. This is why red lights are used to acclimate the eyes for darkness. The illuminated scopes are to see the reticle in low light, where you do not want to harm your night vision.

Correct answer...
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/20/2013 at 02:29
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Originally posted by 3_tens 3_tens wrote:

The human eye dilates less to red light than it will to green light. This is why red lights are used to acclimate the eyes for darkness. The illuminated scopes are to see the reticle in low light, where you do not want to harm your night vision.

Correct conclusion.  Not so sure about the whole eye dilation argument.

I thing what you were trying to say was that since light sensitive cells in your eye that are primarily responsible for low light vision (i.e. rods) have low sensitivity to red, presence of red light is less likely to screw up your night vision by making your eye pupil contract.  You want your eye pupils dilated to see in the dark.

As a practical matter, red makes for pretty good reticle illumination for low light situations since it has less effect on your night vision and since most scattered light available at night is in the blue-green part of the spectrum.  Hence, a faintly illuminated red reticle still stands out nicely.

If you decide to use a green illuminated reticle in low light, you have to be absolutely sure that the intensity is not too bright or you will see nothing, but the reticle in short order.

ILya
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/20/2013 at 10:53
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The other reason for red, I think, is simply that there's very few things in nature that are bright red, so red will always contrast nicely against just about any background. Some people will always prefer different colors, but most mfgs of illuminated scopes use red. I kinda like the amber/orange illumination that Swarovski uses in their Z6i series scopes. I think it really contrasts nicely without being overpowering.
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