Yes Adam, but convergence gives slightly* different perspective to the
two images.. that's the effect that puzzles me most.


*not so slightly when macroing, of course


At 19.17 2008.12.13, you wrote:
>The only practical differerence between stero pictures that converge
>and those that are parallel is with convergence the images overlap
>nearly 100%.  Asume we take the left image as the standard.  The right
>image, in a parallel stereo capture, has a little less image on the
>left side, and a little mre on the right - it is effectively panned
>the distance between the lenses.  So with a converging stereo system
>you ideally get 100% image coverage that overlaps for both eyes.  With
>a parallel stereo system you get a little less depending on the
>distance to the edge imagery.  If the object of focus is very close to
>the cameras then the coverage loss is more pronounced - the area of
>focus where convergence is important.
>
>Our eyes converge because they can - the primary reason for eye
>movement to to avoid head movement.  Convergence is simply "icing on
>the cake" - a free tool we can use.
>
>Only when focusing very close to our face is convergence a useful
>feature - otherwise we would be fine without convergence.
>
>Further, "center" is just a definition in a picture- if you crop one
>side of the picture, the effective 'center' moves.  Our brain will
>automatically determined what is 'center' on a stero picture, even if
>it diverged when the pictures was taken.
>
>-Adam
>
>On Sat, Dec 13, 2008 at 12:20 PM, Electron <electron2k4@infinito.it> wrote:
>>
>> Hi all,
>> I wonder why all stereo cams I saw around have the two virtual eyes parallel
>> each other, while we humans make them converge somewhere.
>>
>> Is it correct to keep the cameras parallel (as then our eyes will converge to
>> the screen) or it would be better to converge the cameras as well?
>>
>> Bye!
>>
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