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Message: <blockquote data-quote="ronh" data-source="post: 1224845" data-attributes="member: 55514">Rpn, Thanks again. You have shared so much information! The second link has "background" information that looks in-depth. I have touched on color and vision science due to my interest in achromatic astronomical telescopes, and vaguely knew there was a whole world of color perception science out there. I hope to learn some more about it.RonLeica focus rationalization continued: Many do not realize that the harsh environmental extremes against which the Leica is guaranteed refer, not to the survivability of the optic (which has yet to be challenged by any conditions on this planet), but to holding focus within 1/2 wave precision. I have recently spoken with Leica engineers, who are now building a "Standard Amazonian Waterfall" that every unit will be required to pass over and crash onto the rocks beneath, without focus slippage. Hopefully, this will reduce the unit to unit variations that some users have remarked on. Once this facility is commisioned, Trinovid and Ultravid original owners will be encouraged to send their binoculars in for testing. The mechanism will be tightened, free of charge, as necessary to pass this heightened level of stringency.</blockquote>