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P3D Re: formats and focal lengths



>From: Bruce Springsteen <bsspringsteen@xxxxxxxxx>

>Squash and stretch have *nothing* to do with stereo base.  Zero.  Nada. 
>The notion that hyperstereo stretches an image is a common misperception
>of the scaling effects of base changes.  Many people will try to tell you
>otherwise.  It is a fallacy. 

Agreed.  But let's be practical.  If you shoot stereo with longer lenses
because you want to increase your image size (as in wildlife photography)
should you also increase the stereo base, or not?

Only by increasing the stereo base you get anything that does not have
obvious "compression" and cardboarding built into it.  The two actions
do not "cancel" each other but even Ferwerda states that the deformations
will not be noticeable if you isolate the subject and it does not have
much depth to it (which is how this technique is normally used).

George Themelis