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Message: <blockquote data-quote="John Russell" data-source="post: 1607810" data-attributes="member: 22179">OK, a colour bias means that there is higher absorbtion somewhere in the spectrum and that is undesirable but I cannot understand the nitpicking about minor colour deviations in bins and scopes and hold the assertion that they could affect an identification for wildly exaggerated.I have one of the older Zeiss Diascopes with a rather pronounced yellow tint but I never really noticed it until I put the Diascope up side by side with a new Leica Apo-Televid 82.Great White Egrets, Spoonbills and Swans all appear white in the Diascope. There is no direct comparison with reality. Otherwise we wouldn't need the bins or scope.Colour rendition in field guides BTW can only be an approximation. Colour temperature varies according to the time of day and meteorological conditions but the eyes and brain adapt and even under tungsten or neon light (whose spectral analysis is a series of spikes) we perceive white paper as being white.Maybe there are disadvantages in using military bins with laser filters but isn't the rest all hype?John</blockquote>