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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
~40mm objectives Vs ~50mm objectives (500 yards and in)?
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<blockquote data-quote="Varmint Hunter" data-source="post: 1754533" data-attributes="member: 313"><p>The column of light (exit pupil) that reaches your eye should be 7mm or more. Its easy to calculate by dividing the objective lens diameter by the magnification. Example: A scope with a 50mm objective lens that is set on 14x will have an exit pupil of only 3.6mm, far smaller than you would want in marginal light. But .... if you turn the magnification down to about 7x then you will achieve a 7mm exit pupil which provides the maximum light column usable by most eyes.</p><p></p><p>Now consider a scope with a 42mm objective lens. If you want to achieve the same 7mm light column you can use a magnification of 6x. Is the difference between 6x and 7x make enough difference for you to choose a 50mm scope? Something to consider.</p><p></p><p>Large objective lens just let you use slightly more magnification than smaller objective lens do.</p><p></p><p>The above assumes that the same quality glass is used.</p></blockquote><p></p>
[QUOTE="Varmint Hunter, post: 1754533, member: 313"] The column of light (exit pupil) that reaches your eye should be 7mm or more. Its easy to calculate by dividing the objective lens diameter by the magnification. Example: A scope with a 50mm objective lens that is set on 14x will have an exit pupil of only 3.6mm, far smaller than you would want in marginal light. But .... if you turn the magnification down to about 7x then you will achieve a 7mm exit pupil which provides the maximum light column usable by most eyes. Now consider a scope with a 42mm objective lens. If you want to achieve the same 7mm light column you can use a magnification of 6x. Is the difference between 6x and 7x make enough difference for you to choose a 50mm scope? Something to consider. Large objective lens just let you use slightly more magnification than smaller objective lens do. The above assumes that the same quality glass is used. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
~40mm objectives Vs ~50mm objectives (500 yards and in)?
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