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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="Frog4aday" data-source="post: 1659440" data-attributes="member: 9308"><p>I'm guessing the two scopes you are looking at are the Leupold VX-5HD 3-15X44mm vs. the 3-15X56mm. (There is a 7-35X56mm scope, too, so knowing the magnification range matters in advising you.)</p><p></p><p>IF you go with the 44mm objective scope and want to use it at 15X, the exit pupil (circle of light going into your eye) is only going to be 2.93mm. In my opinion, that's too small unless you are 70+ years old (at which point, that's about as big as your pupil is anyway.) If you are okay using the scope at magnifications of 11X <strong>or less</strong> (which would give you a 4mm exit pupil, and larger) then the 44mm objective scope will be fine. But then it begs the question - why bother getting the 15X 'capability' if it really doesn't matter?</p><p></p><p>The larger objective scope (56mm) @ 15x will be giving you a 3.73mm exit pupil (circle of light for your eye to see) which is just under the 4mm threshold I consider as necessary in low-light conditions when our pupils will be larger than they are during the brightness of daylight. If you want to see a full, bright image at 15X, even at dawn and dusk - without having to search for, and line up, the image behind the scope - you want the 56mm objective lens.</p><p></p><p>This means taller scope rings and perhaps an adjustable check rest to get a proper cheek weld. No free lunches here. Smaller scope sits lower and a gun with a high comb will work 'as is' with it. But it can't be used as easily/effectively as the power of the scope is cranked up.</p><p></p><p>A maximum 10X scope with a 40mm or larger objective lens is just about perfect for most hunting. But this is the LRH forum, so 'normal' and 'most' goes out the window a lot on here.</p><p></p><p>It you really want to use that 15X power, you'd be better off with the larger objective, but there is a price to pay (cheek weld to the stock is lost?)</p><p></p><p>I'm in the eye biz and kids under 10 y/o can have pupils as big as 10mm in low light! Most 70 year olds and up have small pupils (3mm or less.) Just a fact of life - get older and pupils get smaller. That's why grandpa always wants more light to see stuff around the shop or house. Aging - it ain't for sissies.</p></blockquote><p></p>
[QUOTE="Frog4aday, post: 1659440, member: 9308"] I'm guessing the two scopes you are looking at are the Leupold VX-5HD 3-15X44mm vs. the 3-15X56mm. (There is a 7-35X56mm scope, too, so knowing the magnification range matters in advising you.) IF you go with the 44mm objective scope and want to use it at 15X, the exit pupil (circle of light going into your eye) is only going to be 2.93mm. In my opinion, that's too small unless you are 70+ years old (at which point, that's about as big as your pupil is anyway.) If you are okay using the scope at magnifications of 11X [B]or less[/B] (which would give you a 4mm exit pupil, and larger) then the 44mm objective scope will be fine. But then it begs the question - why bother getting the 15X 'capability' if it really doesn't matter? The larger objective scope (56mm) @ 15x will be giving you a 3.73mm exit pupil (circle of light for your eye to see) which is just under the 4mm threshold I consider as necessary in low-light conditions when our pupils will be larger than they are during the brightness of daylight. If you want to see a full, bright image at 15X, even at dawn and dusk - without having to search for, and line up, the image behind the scope - you want the 56mm objective lens. This means taller scope rings and perhaps an adjustable check rest to get a proper cheek weld. No free lunches here. Smaller scope sits lower and a gun with a high comb will work 'as is' with it. But it can't be used as easily/effectively as the power of the scope is cranked up. A maximum 10X scope with a 40mm or larger objective lens is just about perfect for most hunting. But this is the LRH forum, so 'normal' and 'most' goes out the window a lot on here. It you really want to use that 15X power, you'd be better off with the larger objective, but there is a price to pay (cheek weld to the stock is lost?) I'm in the eye biz and kids under 10 y/o can have pupils as big as 10mm in low light! Most 70 year olds and up have small pupils (3mm or less.) Just a fact of life - get older and pupils get smaller. That's why grandpa always wants more light to see stuff around the shop or house. Aging - it ain't for sissies. [/QUOTE]
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44mm vs 56mm objective, need advice
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