Re: Custom 3D video cameras

[P3D Gregory J. Wageman <gjw@xxxxxxxxxx>]

Ray H. writes:

>"Stereographics Corp." uses electronic circuitry in their products to
>produce a 'side-slipping' of the images to create what they call
>"coincidence", rather than "convergence".  This is equivilant to shooting
>film with parallel cameras and positioning the convergence (coincidence)
>point during mounting.
>
>I am looking for a mechanical solution.

As we discussed not too long ago in long and painful detail, offsetting
the lenses from the center of the film apertures is equivalent to masking
off part of the image.  In conventional stereo still cameras, the lenses
are offset inward with respect to the center of the film apertures.

So it seems to me you could make a thin metal mask to block a vertical
strip of the right side of the left CCD (as seen from the rear), and
the left side of the right CCD and obtain the same results as shifting
the lenses, except that you will lose a bit of image area.  If the masks
were attached to adjusting screws, and slid left and right in horizontal
channels, this would allow setting the window.  Ideally you'd want them
coupled, of course.

	-Greg W.


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