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Sooo...when the exit pupil is larger than the 6 or 7mm diameter that a human eye can see, there is no improvement in light transmission. When a 3x9x40 is set on the lower powers, that give an exit pupil greater than 7mm, you will still only see the same amount of light as if it was producing an exit pupil of only 7mm, the additional light is wasted. So don't think if you get a 4x50 you will have a brighter image than a 4x30.
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