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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Light Transmission
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<blockquote data-quote="bruce_ventura" data-source="post: 1045497" data-attributes="member: 34084"><p>You're saying that a bino with a 4.2 mm exit pupil lasted longer in low light than a scope with a 7.7 mm exit pupil. </p><p></p><p>I don't know how dark "dusky dark" is. If that means 15-30 minutes after sunset, your eye pupil was probably about 5 mm. Your age and the actual light level are big factors, so it's difficult to guess. If your eye pupil was 5 mm, that means the Nikon had at least 40% better transmission than the Vortex. It seems unlikely that the Vortex transmission could be that low. A scope can only lose that much light because of the anti-reflection lens coatings. The coatings would have to be really bad to loose 40%. If that were the case with all Viper PAs, a lot of other hunters would be complaining. </p><p></p><p>I'm left with the conclusion that "dusky dark" was at or before sunset, and your eye pupil was closer to 4 mm. In that case you were seeing the difference between Nikon and Viper PA anti-reflection coatings, which could be as much as 5-10%. That's a more likely scenario. </p><p></p><p>Another possibility is that the lenses on the Viper were dirty. </p><p></p><p>If it was substantially after sunset and the Vortex lenses were clean, you should contact Vortex.</p></blockquote><p></p>
[QUOTE="bruce_ventura, post: 1045497, member: 34084"] You're saying that a bino with a 4.2 mm exit pupil lasted longer in low light than a scope with a 7.7 mm exit pupil. I don't know how dark "dusky dark" is. If that means 15-30 minutes after sunset, your eye pupil was probably about 5 mm. Your age and the actual light level are big factors, so it's difficult to guess. If your eye pupil was 5 mm, that means the Nikon had at least 40% better transmission than the Vortex. It seems unlikely that the Vortex transmission could be that low. A scope can only lose that much light because of the anti-reflection lens coatings. The coatings would have to be really bad to loose 40%. If that were the case with all Viper PAs, a lot of other hunters would be complaining. I'm left with the conclusion that "dusky dark" was at or before sunset, and your eye pupil was closer to 4 mm. In that case you were seeing the difference between Nikon and Viper PA anti-reflection coatings, which could be as much as 5-10%. That's a more likely scenario. Another possibility is that the lenses on the Viper were dirty. If it was substantially after sunset and the Vortex lenses were clean, you should contact Vortex. [/QUOTE]
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Light Transmission
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