BirdForum is the net's largest birding community dedicated to wild birds and birding, and is absolutely FREE!

Register for an account to take part in lively discussions in the forum, post your pictures in the gallery and more.

Reply to thread

Message: <blockquote data-quote="henry link" data-source="post: 559616" data-attributes="member: 6806"><p>I don't think these kinds of manipulations of color transmission are ever desirable in a birding binocular. Some might be useful for eye protection in snow/sand or target acquisition for hunters in special circumstances, but they will always lead to decreased color accuracy and lower overall light transmission. A coating that rejects green wavelengths can't really even be counted on to increase contrast between "brown" objects and a green field unless the brown (yellow,red) objects are as bright or brighter than the green background. If the brown objects are darker than the green background then reducing green transmission will actually decrease contrast. A more serious penalty from coatings rejecting green wavelengths would be reduced low light performance since the eye is most sensitive to blue/green in low light. In fact, the combination of coatings and glass in binoculars is already pretty non-linear in regard to color transmission without making it worse on purpose. Typically, in most binoculars there is a peak in transmission somewhere between 550(yellow/green) and 650nm (red) and a drop off in transmission at wavelengths below 500nm (green) which may reach 20-30% or more at 420nm (violet) .</p></blockquote><p></p>