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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="Varmint Hunter" data-source="post: 1659054" data-attributes="member: 313"><p>This is my understanding:</p><p>The column of light reaching your eye through a rifle scope is referred to as the exit pupil. An average person's eye can dilate to about 6mm and ,thus, does not benefit by a larger exit pupil than about 6mm. Younger eyes dilate slightly more and older eyes slightly less.</p><p>The exit pupil of a scope is calculated by dividing the objective diameter by the magnification.</p><p>ex: A 50mm objective scope that has a magnification of 8x would result in an exit pupil of 6.25mm, which is about the maximum usable amount of light your eye can benefit from.</p><p>The real benefit of a 56mm lens is that it would allow you to set the magnification to 9x and still have an exit pupil of 6.25mm. Not really much of a benefit IMO.</p><p>If you went with a standard 40mm objective you would get the same exit pupil and amount of usable light just by turning the magnification down to 6.5x</p><p>Using a 50mm objective on a scope set at 4x provides an exit pupil of 12.5mm, which is nearly useless because your eye can only dilate to aprox 6mm. The single benefit of such a large exit pupil (with low magnification) is that you can acquire your sight picture faster.</p><p>Lastly, lens quality and construction trumps all. A 56mm objective on a cheap scope will not provided nearly as good of an image as a high quality 40mm scope.</p><p>In a nut shell, the only real benefit of LARGE objective scopes is that you can use slightly higher magnification under low light conditions.</p><p></p><p>Just my 2 cents</p></blockquote><p></p>
[QUOTE="Varmint Hunter, post: 1659054, member: 313"] This is my understanding: The column of light reaching your eye through a rifle scope is referred to as the exit pupil. An average person's eye can dilate to about 6mm and ,thus, does not benefit by a larger exit pupil than about 6mm. Younger eyes dilate slightly more and older eyes slightly less. The exit pupil of a scope is calculated by dividing the objective diameter by the magnification. ex: A 50mm objective scope that has a magnification of 8x would result in an exit pupil of 6.25mm, which is about the maximum usable amount of light your eye can benefit from. The real benefit of a 56mm lens is that it would allow you to set the magnification to 9x and still have an exit pupil of 6.25mm. Not really much of a benefit IMO. If you went with a standard 40mm objective you would get the same exit pupil and amount of usable light just by turning the magnification down to 6.5x Using a 50mm objective on a scope set at 4x provides an exit pupil of 12.5mm, which is nearly useless because your eye can only dilate to aprox 6mm. The single benefit of such a large exit pupil (with low magnification) is that you can acquire your sight picture faster. Lastly, lens quality and construction trumps all. A 56mm objective on a cheap scope will not provided nearly as good of an image as a high quality 40mm scope. In a nut shell, the only real benefit of LARGE objective scopes is that you can use slightly higher magnification under low light conditions. Just my 2 cents [/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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