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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Swaro vs Huskemaw
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<blockquote data-quote="azarcher10x" data-source="post: 2887117" data-attributes="member: 57286"><p>Way to deep. It's the amount of light coming through the optic to the eye. Simply put, the human eye will dilate to approximately 5mm. At that, the eye is straining to see. The exit pupil of the optic is number you would want to pay attention to. The math is simple. Divide the size of the objective by the power. Anything over 5 is good for your eye and is good for lower light situations. The human eye functions best when dilated to about 3mm. That's the baseline. I rarely use my spotter very long, maxed out at 75 power, with an exit pupil of 1.13mm, unless I'm looking at Jupiter or something! </p><p>A lot has to do with the amount of time you're spending looking through the optic. For glassing in early mornings and late evenings, I love to use my 10x54 Zeiss Victory binos. The exit pupil is 5.4mm. Middle of the day, 15x56 are great.</p><p>Rifle scopes were not meant for glassing. You normally won't be spending long times staring through your rifle scope. At 25 power with a 50mm objective, you'll still have an exit pupil of only 2mm. The size of the tube doesn't change this. The tube size will help with how much adjustment is available in the scope. A larger objective lens will help. The help with getting as much usable light to your eye with a 2mm exit pupil, is in the quality of the glass and the coatings. It's referred to as light transmission. I stated previously in this thread, most of the major manufacturers use Schott glass, which is Zeiss. The differences are in the coatings. The high end scopes all have coatings designed to maximize light transmission. The difference between them, is usually in the coatings having to do with color contrast. Some manufacturers use coatings so that colors appear cooler and some use warmer coatings. At this point, it's pretty much personal preference. When choosing a high end scope, or any quality optic, look at the color contrast you prefer.</p></blockquote><p></p>
[QUOTE="azarcher10x, post: 2887117, member: 57286"] Way to deep. It's the amount of light coming through the optic to the eye. Simply put, the human eye will dilate to approximately 5mm. At that, the eye is straining to see. The exit pupil of the optic is number you would want to pay attention to. The math is simple. Divide the size of the objective by the power. Anything over 5 is good for your eye and is good for lower light situations. The human eye functions best when dilated to about 3mm. That's the baseline. I rarely use my spotter very long, maxed out at 75 power, with an exit pupil of 1.13mm, unless I'm looking at Jupiter or something! A lot has to do with the amount of time you're spending looking through the optic. For glassing in early mornings and late evenings, I love to use my 10x54 Zeiss Victory binos. The exit pupil is 5.4mm. Middle of the day, 15x56 are great. Rifle scopes were not meant for glassing. You normally won't be spending long times staring through your rifle scope. At 25 power with a 50mm objective, you'll still have an exit pupil of only 2mm. The size of the tube doesn't change this. The tube size will help with how much adjustment is available in the scope. A larger objective lens will help. The help with getting as much usable light to your eye with a 2mm exit pupil, is in the quality of the glass and the coatings. It's referred to as light transmission. I stated previously in this thread, most of the major manufacturers use Schott glass, which is Zeiss. The differences are in the coatings. The high end scopes all have coatings designed to maximize light transmission. The difference between them, is usually in the coatings having to do with color contrast. Some manufacturers use coatings so that colors appear cooler and some use warmer coatings. At this point, it's pretty much personal preference. When choosing a high end scope, or any quality optic, look at the color contrast you prefer. [/QUOTE]
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Swaro vs Huskemaw
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