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Posted: 7/6/2007 7:27:41 PM EDT
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Another bit I need to learn - explanations? Thanks |
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The distance you eye must be from the rear of a optic in order to see through it. example: ACOG 4X like a TA31F- Eye relief is within a couple of inches of the optic. This means that in whatever position you and your rifle are in your eye must be within that distance of the scope to view through it to sight. Easy on the range, however if you ever do quick prone or baracade shooting it is harder. Aimpoint/ EOTech- Not magnified so your eye can be as far away as you need it to be and still have a sight picture with the dot. Very quick types of optics. |
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There are 2 aspects to eye relief: - Optimal eye relief - that's the distance your eye has to be from the rear lens (not the rear rear of the scope) to get a good image, as mentioned above. All scopes have a spec for eye relief distance. - Eyebox - this is the range you can get good eye relief at, usually with the optimal eye relief around the center. A generous eyebox will allow you to get good eye relief without having to hunt back and forth, while a tight eyebox requires your eye be in a pretty specific position to get a good image. Both optimal eye relief and the eyebox size change with zoom factor on zoom scopes, so your eye relief will be different at 3x and 9x on a 3-9 scope. If a scope has a small eyebox, this means your cheekweld position may be different at 3x and 9x, while a scope with a large eyebox will allow you to use the same eye position for the entire zoom range, even though the optimal eye relief position has changed. If you look at the Leupold's specs, they give an optimal eye relief distance for both ends of the zoom range (but nobody specs eyebox that I know of). More and more scope makers are starting to do this, which is a good thing. |
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