P3D Re: Mounting of Stereo Prints, a century old (and longer) Problem

[Paul Talbot <ptww@xxxxxxxxx>]

re: BILL C WALTON provided guidance on mounting stereo prints.

Thanks for the pointers Bill.  It's good to hear some helpful advice
from an experienced stereoview maker.  One thing (of many; it takes
me a while to catch on) I don't understand:

> As far as the image being to close or to far from the window that
> can be adjusted by moving the images apart or pushing them together.

In a normal (surface mounted) stereo print how could this be?

Given the layout of a stereo pair:
   L              R
   |----------|   |----------|
   |          |   |          |
   |O         |   | O        |
   |          |   |          |
   |          |   |          |
   |----------|   |----------|

As I understand it, the closest object, indicated by O above, would
appear behind the window because the distance from O(L) to O(R) is
greater than the spacing of the edges of the image (the distance from
L to R).  To move the closest object closer to the window requires
altering the stereo pair in such a way that the distance L~R is the
same as the distance O(L)~O(R).  If the two prints are only moved closer
together or farther apart, O(L)~O(R) will always remain greater L-R and
the position of the image with respect to the window will not change.

I can see how moving the prints closer together or farther apart will
adjust the window if they are behind a mask (e.g., Q-Vu), but it
doesn't seem to work for surface-mounted pairs.  What am I missing?

Thanks,

Paul Talbot


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