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Message: <blockquote data-quote="Omid" data-source="post: 3194668" data-attributes="member: 16724">Yes, the eyes can only converge. Now, consider the "diverging field binoculars" I depicted in my first post. Assume a target point in the center of the overlapping area between two barrels. The left eyepiece shows this point on the right side of its optical axis. The right eyepiece will show this point on the left side of its optical axis. Therefore, the eyes will need to "converge" to see this point. In fact, binoculars with "diverging field of view" will increase the "convergence" required by the eyes to see the same point.        Yaaay!! That's true! I hadn't thought about this possibly either. We can also increase the total horizontal field of view by making the binoculars convergent. The possibility of increasing field of view as we are describing here has been applied to Head-Mounted Displays (HMD) used by helicopter pilots. I found a research document on this concept which explains how the viewing experience would be different from the "full overlap" mode (see attached page).</blockquote>