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="elkcub" data-source="post: 1530750" data-attributes="member: 14473">I'd imagine that either hypothesis concerning tube differences could be put to the test,— in a lab.  In the first instance the aberration discrepancy would need to be specified, although I can't think of any (differences) that would directly impact depth perception.  Still, it could be.  In the second instance, vertical divergence would probably cause double vision (diplopia) before it effected depth perception.  Possibly in a narrow range it could be, but...I'm skeptical.In general, Jean-Charles, I believe some binoculars do produce a greater perception of depth than others of the same power and aperture.  The effect is subtle for me, but I've experienced it reliably, and it has withstood specimen variation.  My only explanation is that it's a property of the design that interacts with vision processes.    Ed</blockquote>