[photo-3d] Too far behind the window (was "A Fine View", Grand Canyon, AZ.)

[Paul Talbot <list_post@xxxxxxxxx>]

"Dr. George A. Themelis" wrote:

> Originally, I had this mounted in a 31.5mm RBT mount and
> it looked great in my Van Ekeren viewer.  However, when
> I saw it projected at the NY Stereoscopic Society (this
> was one of the slides I showed at the NSSS meeting in
> July) I realized that the scene was a bit too far behind
> the window.

If anyone is wondering about the logic of this...

The z-axis is stretched when projected slides are viewed
from farther away than the "ortho seat."  This stretch grows
to very significant amounts the farther you are away from
the screen.  Stretching the z-axis causes any distance
between the stereo window and the closest object of the
scene to also be exaggerated.  When mounting an image that
will be projected, it becomes especially important to set
the stereo window extremely close to the nearest object.
Otherwise, you risk creating the impression that the scene
is *very, very far* behind the window.

Paul Talbot