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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
44mm vs 56mm objective, need advice
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<blockquote data-quote="PeterT" data-source="post: 1659243" data-attributes="member: 78344"><p>If light transmission is your main concern then this might help: The male human eye dilates to approximately 7 mm in low light. If the diameter of the circle of light that leaves the ocular lens of the scope is less than 7 mm you could use more light if more than 7 mm the excess will not, in fact, enter your eye. To determine the optimum exit pupilary diameter from a scope divide the diameter of the objective lens by 7 mm (your dilated pupil's diameter).</p><p>If you have a 56 mm objective it would = 8X for maximum useful light transmission.</p><p>If you have a 50 mm objective it would = 7X for maximum useful light transmission.</p><p>As you can see there is very little difference in optimum magnification for useful illumination. As a result, in keeping with other comments, the ability to mount the scope lower to the action my be your primary concern.</p></blockquote><p></p>
[QUOTE="PeterT, post: 1659243, member: 78344"] If light transmission is your main concern then this might help: The male human eye dilates to approximately 7 mm in low light. If the diameter of the circle of light that leaves the ocular lens of the scope is less than 7 mm you could use more light if more than 7 mm the excess will not, in fact, enter your eye. To determine the optimum exit pupilary diameter from a scope divide the diameter of the objective lens by 7 mm (your dilated pupil's diameter). If you have a 56 mm objective it would = 8X for maximum useful light transmission. If you have a 50 mm objective it would = 7X for maximum useful light transmission. As you can see there is very little difference in optimum magnification for useful illumination. As a result, in keeping with other comments, the ability to mount the scope lower to the action my be your primary concern. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
44mm vs 56mm objective, need advice
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