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Message: <blockquote data-quote="henry link" data-source="post: 3369648" data-attributes="member: 6806">Binastro,I was able to take a brief look at an 8x42 Aculon in a store today. I'm quite sure the prisms are uncoated and the exterior surfaces are multicoated. As for the interior lens surfaces, I think the ones I could see are probably single layer coated. Initially their bright reflections look uncoated compared to the dimmer green multicoating, but they look less bright than the dazzling pure white uncoated prism reflections and appear to me to be slightly tinted a very pale violet. I would guess that a binocular with this combination of two multicoated surfaces, four single layer coated surfaces and four uncoated surfaces might have around 75%-80% transmission. The biggest loss is from the prisms, which might have cost an extra dollar to coat and that would have added at least 10% to the light transmission. A case of bean counters working overtime, I guess.Henryedit: I just noticed there is an Allbino's review of the 10x50 Aculon from last year.<a href="http://www.allbinos.com/286-binoculars_review-Nikon_ACULON_A211_10x50.html" target="_blank">http://www.allbinos.com/286-binoculars_review-Nikon_ACULON_A211_10x50.html</a>They give the light transmission as 78.2%, but if you look at the spectral transmission chart it's quite uneven, going from a high of around 82-83% in the red at around 650nm to around 78% at the 550nm peak of daylight eyesight sensitivity and then falling through the blue to about 65% at 450nm. They also noticed the lack of coatings inside.</blockquote>

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