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<blockquote data-quote="Allen" data-source="post: 195952" data-attributes="member: 389">Kurt hit it fairly accurately.The big glass manufacturers all tend to use glass with about 85-92% light transmission.&nbsp; Meaning, 85-92% of the light that hits the front lens makes it back to your eyeball.&nbsp; The difference really comes in coatings that literally block certain wavelengths of light.&nbsp; The theory here is that if you block a certain wavelength of light, the missing wavelength(s) result in a crisper definition in your perception.The hitch in the giddy-up here is that no two human eyeballs are the same. What results in a better image to me may very well be the absolute worst for you.&nbsp; So Leupold, Nikon, etc are all using what they consider to be the best data on the human eyeball and in that sense it's a numbers game.&nbsp; One company is targeting a customer base that benefits the most from the blocking of XX suite of the white light spectrum, and the next targets a slightly different set of wavelengths.So there really is NO best optic.&nbsp; The coatings that block a set of light wavelengths are available to all optic manufacturers. Sure, there can be differences in how they each apply coatings, and the resulting product. So this makes tiers of optics manufacturers, but no clear winner.I worked with very high end optics for a few years and this stuff was important enough for me to really read up on it.&nbsp; For quite a long time, Nikon had by far the most light transmittance glass out there.&nbsp; But even then their coatings weren't for everyone.</blockquote>

[QUOTE="Allen, post: 195952, member: 389"] Kurt hit it fairly accurately. The big glass manufacturers all tend to use glass with about 85-92% light transmission. Meaning, 85-92% of the light that hits the front lens makes it back to your eyeball. The difference really comes in coatings that literally block certain wavelengths of light. The theory here is that if you block a certain wavelength of light, the missing wavelength(s) result in a crisper definition in your perception. The hitch in the giddy-up here is that no two human eyeballs are the same. What results in a better image to me may very well be the absolute worst for you. So Leupold, Nikon, etc are all using what they consider to be the best data on the human eyeball and in that sense it's a numbers game. One company is targeting a customer base that benefits the most from the blocking of XX suite of the white light spectrum, and the next targets a slightly different set of wavelengths. So there really is NO best optic. The coatings that block a set of light wavelengths are available to all optic manufacturers. Sure, there can be differences in how they each apply coatings, and the resulting product. So this makes tiers of optics manufacturers, but no clear winner. I worked with very high end optics for a few years and this stuff was important enough for me to really read up on it. For quite a long time, Nikon had by far the most light transmittance glass out there. But even then their coatings weren't for everyone. [/QUOTE]

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