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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Nightforce 50mm or 56mm?? Which One..
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<blockquote data-quote="bruce_ventura" data-source="post: 1022817" data-attributes="member: 34084"><p>Unfortunately two different people doing that comparison can reach fundamentally different conclusions. You can prove this by comparing performance at two magnifications. </p><p></p><p>At 7X or below both scopes should appear to have very similar brightness. That's because even the 50 mm scope provides a 7 mm exit pupil at that magnification, which is larger than your eye pupils. That is, there is no exit pupil effect, so glass transmission is the dominant effect. The difference in glass transmission between the two scopes is probably less than 3%, which is very difficult for the human eye to see. </p><p></p><p>At 14X or above, there should be an obvious difference between the two scopes. The 56 mm scope has a 4 mm exit pupil at that magnification, and the 50 mm scope has a 3.6 mm exit pupil. If your eyes are dark adapted at the start or end of legal hunting, your pupils should be at least 4 mm, which is larger than the exit pupil of either scope. In this case, the 56 mm scope should appear about 25% brighter.</p></blockquote><p></p>
[QUOTE="bruce_ventura, post: 1022817, member: 34084"] Unfortunately two different people doing that comparison can reach fundamentally different conclusions. You can prove this by comparing performance at two magnifications. At 7X or below both scopes should appear to have very similar brightness. That's because even the 50 mm scope provides a 7 mm exit pupil at that magnification, which is larger than your eye pupils. That is, there is no exit pupil effect, so glass transmission is the dominant effect. The difference in glass transmission between the two scopes is probably less than 3%, which is very difficult for the human eye to see. At 14X or above, there should be an obvious difference between the two scopes. The 56 mm scope has a 4 mm exit pupil at that magnification, and the 50 mm scope has a 3.6 mm exit pupil. If your eyes are dark adapted at the start or end of legal hunting, your pupils should be at least 4 mm, which is larger than the exit pupil of either scope. In this case, the 56 mm scope should appear about 25% brighter. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Nightforce 50mm or 56mm?? Which One..
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