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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="nmbarta" data-source="post: 1659533" data-attributes="member: 78438"><p>size matters!</p><p>With equal quality glass, bigger objective allows more light. Everyone knows that, but it depends on the max magnification of your scope and when you plan on using that. If the exit pupil drops below 2mm your going to have a very dark image, even with the best glass known to man. I've been blessed with very good eye sight (color blind, but I'll take what I can get) Even in normal light, below 2mm will start to darken and at 1.5mm it becomes very dark.</p><p>So you want to take the max magnification that you plan on using at dusk or dawn and do the math. A 24x scope with a 42mm objective has an exit pupil of 1.75 at max magnification, and I can tell you that even in a 3000 dollar scope, it doesn't work unless it's bright out. At 18x it has an exit pupil of 2.33 and works great.</p><p></p><p>The size of the tube doesn't matter at all, it allows for more adjustment not more light.</p><p></p><p>There are a lot of broad statements about looking through said scope with said lens, but this isn't about opinion, it's about science and fact. At lower magnifications where the exit pupil is above 6 or 7mm it won't make as much difference.</p><p></p><p>I wouldn't buy anything that goes below 2mm, it's a waste of money.</p></blockquote><p></p>
[QUOTE="nmbarta, post: 1659533, member: 78438"] size matters! With equal quality glass, bigger objective allows more light. Everyone knows that, but it depends on the max magnification of your scope and when you plan on using that. If the exit pupil drops below 2mm your going to have a very dark image, even with the best glass known to man. I've been blessed with very good eye sight (color blind, but I'll take what I can get) Even in normal light, below 2mm will start to darken and at 1.5mm it becomes very dark. So you want to take the max magnification that you plan on using at dusk or dawn and do the math. A 24x scope with a 42mm objective has an exit pupil of 1.75 at max magnification, and I can tell you that even in a 3000 dollar scope, it doesn't work unless it's bright out. At 18x it has an exit pupil of 2.33 and works great. The size of the tube doesn't matter at all, it allows for more adjustment not more light. There are a lot of broad statements about looking through said scope with said lens, but this isn't about opinion, it's about science and fact. At lower magnifications where the exit pupil is above 6 or 7mm it won't make as much difference. I wouldn't buy anything that goes below 2mm, it's a waste of money. [/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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