Bob is right here. The fov difference is insignificant. Lee make the point about a 19% increase in viewing area, but that too is, as a practical matter...insignificant. That is my opinion. What is factored out in fov discussions is that while we can change magnifications, fov width, coatings and other things, we are stuck with our narrow focus human vision. Give that same human vision a 19% larger area, you simply are adding a larger area for our narrow vision, central focused vision at that, to contend with. This, again in my opinion, causes observers to rely more on the fov of the binocular and far too little on our own eyes, which are what should be getting ti most use in a birding situation. There is certainly some advantage to adding peripheral vision,m but those who seem to feel they can dart their eyes to the edge are simply exposing various aberrations that are caused by off axis viewing that were never intended to be tin the center field in the first place. Plus that edge darting seems a splendid way to create eye strain. It is very hard to actually look at the edge of the fov.