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Message: <blockquote data-quote="ksbird/foxranch" data-source="post: 1321539" data-attributes="member: 37413">Mark, I have noticed that when a tiny bit of finger or face oil gets on some coatings they change color and if this oil is smeared around evenly it will change the color completely. This doesn't impair the view significantly, but on my green coated optics, they often change to a purple color reflection etc. Of course the color problem you are having might also be the notoriously poor QC in Russian factories.I purchased a pair of CZJ Binoctar 7x50s and 2 pairs of 10x50 Dekarems in Poland in 1992 and 1995. The color of the multicoatings on the objective lenses varied slightly in each case, even new out of the box, if I allowed light to pass through the eye lenses. But when I blocked the eye lenses, the color variations were reduced. I think that one of the internal lens surfaces on each side of each bin had a heavier multicoating of some color film and this made the final view seem slightly more purple, or yellow-gold or red. The binoculars work great to this day.I purchased these 3 pairs of bins after looking at about a dozen pairs of each one. I was most concerned with the final view through the eye lenses and the maximum sharpness possible. This meant that I was primarily testing the alignment of each lens in the light path and whether each lens set was ground and polished correctly and then glued together correctly. The way the multicoatings  looked for inspection purposes was a lesser consideration.So if the view is sharp and contrasty, the flares are minimized and the collimation is good, then I will probably like the bin, assuming the FOV is wide enough. I hope the Russian bins you got do well for you. The prices are quite astounding when you compare them to others from Japan or even China, new or not.</blockquote>

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