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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Tough Question On Scope: Objective & Exit Pupil
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<blockquote data-quote="Jon Jackoviak" data-source="post: 411153" data-attributes="member: 1825"><p>Well you have the calculations correct, but you have the theory pretty close too. To calculate the exit pupil, you take the objective divided by the power setting. (3-9x40 on 8 power is an exit pupil of 5: 40/8 = 5). But that would not be the maximum mm's of light to travel through the scope. The largest exit pupil on this particular scope would be to have the power set at 3. (40/3 = 13.3). I think where you come up with the 5 is a young healthy eye can only intake about 7mm's of light. As you get older that number starts to go down. An older person may only be able to intake 5mm's of light. So the younger you are the more light your eye can use.</p></blockquote><p></p>
[QUOTE="Jon Jackoviak, post: 411153, member: 1825"] Well you have the calculations correct, but you have the theory pretty close too. To calculate the exit pupil, you take the objective divided by the power setting. (3-9x40 on 8 power is an exit pupil of 5: 40/8 = 5). But that would not be the maximum mm's of light to travel through the scope. The largest exit pupil on this particular scope would be to have the power set at 3. (40/3 = 13.3). I think where you come up with the 5 is a young healthy eye can only intake about 7mm's of light. As you get older that number starts to go down. An older person may only be able to intake 5mm's of light. So the younger you are the more light your eye can use. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Tough Question On Scope: Objective & Exit Pupil
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