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Message: <blockquote data-quote="Steve C" data-source="post: 3370738" data-attributes="member: 56622">Ed,Strangely enough, some of that that makes sense.  I had it down to what I was seeing was a perception of some sort (what is it they say about perception being reality?),  My perceptions in the view I get in the ZEN vs Swif example is that when focused on the same object, there is focus to infinity in both, but the ZEN close focus is about twice as close as the Swift.  So the dof (is it depth of field or depth of focus) thing is something I had been viewing in that vein.  Right or wrong?  I don't know, but there is plenty of stuff to worry about.As for the perception of 3-D, yeah that is a perception.  I never have believed in the old wisdom of superior 3-D effect in porros.  Maybe I'm weird, but I see some 3-D in every binocular I look at.  The best 3-D effect I get is from the Swift 804 and the Bushnell Rangemasters.  But is seems nearly as good in the ZEN and the Maven B2, the latter has a larger objective offset than any other roof I have any experience with.I bet I'd have to read Ferwerda more than once <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink    ;)" loading="lazy" data-shortname=";)" />  Thanks for the response.</blockquote>