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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
March 2-25? 42mm vs 52
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<blockquote data-quote="Will Gray" data-source="post: 1835410" data-attributes="member: 65116"><p>I should give credit to someone (don't have his name) who wrote recently about scope brightness vs power and objective size. The human eye has about a 7mm objective. If you have a 42mm objective scope and use more than six power 42mm/6power = 7mm (the effective objective), any higher power will reduce that value to less than the human eye objective and the image will be dimmer as the power goes up. It is not an issue in bright lighting but at twilight it is obvious: the higher the power the dimmer the image. Buy the best glass quality you can afford and keep the objective diameter divided by the power to seven for maximum perceived brightness. 56mm/8power=7 Just my two cents...</p></blockquote><p></p>
[QUOTE="Will Gray, post: 1835410, member: 65116"] I should give credit to someone (don't have his name) who wrote recently about scope brightness vs power and objective size. The human eye has about a 7mm objective. If you have a 42mm objective scope and use more than six power 42mm/6power = 7mm (the effective objective), any higher power will reduce that value to less than the human eye objective and the image will be dimmer as the power goes up. It is not an issue in bright lighting but at twilight it is obvious: the higher the power the dimmer the image. Buy the best glass quality you can afford and keep the objective diameter divided by the power to seven for maximum perceived brightness. 56mm/8power=7 Just my two cents... [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
March 2-25? 42mm vs 52
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