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Message: <blockquote data-quote="henry link" data-source="post: 3368162" data-attributes="member: 6806">It should be possible to analyze the reflections in a simple binocular like the Aculon. I have an overhead light bulb I use for the purpose. I examine the reflections of the light bulb returning from the exterior and interior surfaces with a magnifier while tilting the binocular to bring different surfaces into view. The Aculon should have ten glass to air surfaces and two small dim reflections from cement. Only the front prism surface is easy to see, but the other three are pretty certain to be the same as it. Binastro's analysis in post #33 suggests that only 2 of the 10 glass to air surfaces are coated at all. That would be pretty miserable and disappointing for a binocular that Nikon calls "multicoated", no matter how cheap the price. If that's so I'd be surprised if the light transmission even reaches 70%. I think I saw a pair of Aculons at the local REI store. I'll be away from the computer on a birding trip till Monday. I''ll have a look when I get back unless you all have it sorted out by then.Henry</blockquote>