Re: Nimslo Prints vs Slides

[bercov@xxxxxxxxxx (John Bercovitz)]

John Bercovitz wrote:

>> Here's another, possibly better, way of thinking about it or
>> saying it.  [.....]

Due to an unfortunate placement of the above paragraph, it looked 
like I was saying that Jim could have said what he said better.  I
actually meant it to apply to my own paragraph, the paragraph above 
his.  What Jim said was well-expressed.  My apologies.

>> I saw a most striking counter-example recently when Andrew Woods
>> showed me stereo video taken with toed-in (converged) cameras.

Jim C wrote:

> Yes, and the same thing can happen in mono!  And for basically
> the same reason.  When you're watching a movie & the camera
> moves, there's an "ortho seat" where the motions on the screen
> re-create the motions in the world exactly (assuming the camera
> lens acts ike a planar projection, anyway).  

It's a funny thing but I did the geometry on perspective and it
matches exactly the geometry for the ortho view.  That is, if 
you don't sit at the ortho seat (which is called the center of
perspective in the mono world) you get the same space distortions
(same in sense and magnitude) whether it's a mono view or a stereo 
view; the distortions match perfectly.  

John B


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