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Message: <blockquote data-quote="Inquisitor" data-source="post: 3148862" data-attributes="member: 129508">I can easily believe that the concept does not actually pan out in the laboratory. But based on my recent moon light testing adventures I also believe that wider fields can psychologically feel brighter, at least for me.....sort of like in a simplistic way saying that a larger bucket holds more water.It is an interesting observation (at least to me) that as exit pupil grows by use of larger diameter objectives - and the traditional format for a "very bright" binocular is created - that the fov usually decreases due to prism size concerns* (the technical whys are way beyond me).  I reckon this sort of proves that in real laboratory terms that brightness is not harnessed to a large fov.Regarding WA eyepieces it would seem that it was taking the same light from the objectives and spreading it over a larger area....thinner, lighter intensity?  Those adjustable flashlights come to mind.I know that I don't know what I am talking about....just thinking.*I don't know if it has to absolutely be this way or if it is merely introduced by trying to keep the binocular a semi-affordable hand sized tool/instrument.</blockquote>