Re: SL3D per John B et al

[T3D John Bercovitz <bercov@xxxxxxxxxxx>]

John R writes:

> [...] I believe that in a real-world situation, 
> at least one of those images is not going to be 
> perfectly square.  
> (That's even *without* tilting the camera.)

I guess real-world lenses always do have a certain
amount of distortion but I think what Paul was
speaking of was an ideal rectilinear lens which 
most lenses today will approach.  A rectilinear lens
will make an image of parallel lines which shows
parallel lines provided the film plane is parallel
to the object plane.  Given that, I think a square
will be "imaged" at the same size regardless of where 
it lies on the in-focus object plane (provided that 
the object plane is parallel to the film plane).

John B


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