Re: Converging lenses (was: Window reversal); D|s-TortiO|\|s

[P3D Michael Kersenbrock <michaelk@xxxxxxxxxxxxxxxxxx>]

> Well if you want to get that effect, then that is a COMPLETELY different
> story. Introducing a distortion fault, for exactly what it is, can be
> justified under the guise of artistic license! But the thrust of the
> argument, was that most people are close minded to new ways of doing 
> things. I don't think this is the case and MOST people if can be shown
> a logical reason for doing something differently, would do so. So far
> NO valid reason to WANT to introduce keystoning, has been given other
> than as artistic license.

Hmmmmmm... okay you want a technical for-reality's-sake sort of reason for
keystoning.

I can think of one.  If my goal is to take stereo photographs which are
intended to be viewed using the type of viewer commonly used for 
"beamsplitter" stereo attachments, then keystoning would *improve* the
technical reality-simulating result.

As I understand it, beamsplitter attachments produce keystoning, but
it's "okay" because the matching viewer undoes it -- yielding an undistorted
image.

So, when NOT using the beamsplitter (or even when doing so) keystoning
is desireable in order to compensate for the viewer's anti-keystoning.

:-)

Mike K.


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