P3D Re: "built in" windows

["Greg Wageman" <gjw@xxxxxxxxxx>]

From: CanterMike@xxxxxxx <CanterMike@xxxxxxx>


>I've been seeing references to (different) camera's "built in" windows
for as
>long as I've been taking stereo pictures.  But I've never seen a good
>explanation of how this effect is achieved, controlled or altered.
What
>changes within the camera's engineering achieve this variety of window
>distances?


An outward shift of the film apertures with respect to the centers of
the taking lenses within the camera.  Since the image is inverted and
transposed on the film, this corresponds to a forward shift of the
window from infinity towards the taking position, exactly like pushing
the film chips closer together when mounting.  I was looking for my copy
of Waack to find the exact equations involved, but he seems to be lost
in my library at the moment. :-)

     -Greg W. (gjw@xxxxxxxxxx)