P3D Re: Three L rule

[George Themelis <gthemelis@xxxxxxxxx>]

> I now instinctively look to see if I see
> more in the left side of the right chip...

And what if I don't?  I then pull the right chip to the right. 
By doing this, I am exposing more of the scene, resulting is
seeing more, or, in more technical terms :-) resulting in
pushing the stereo window towards the observer (or the scene
away from the window).

For those who work with stereo prints the same ideas apply. 
Only, if you are not using a mask (some people do) you have to
create the same effect by cutting the prints.  If the two
sections are made so that each eye sees EXACTLY the same amount
of a certain object, then you have set your stereo window at the
level of this object.  If your cuts are such that the left edge
of the left print shows less of the object (or the left edge of
the right print shows more, as I apply it) then you have set
your stereo window in front of this object.

If you use twin cameras or other stereo equipment that don't
have a built-in stereo window then your stereo window will be
at infinity.  This is a really bad placement for a stereo
window.  (I don't want to say "the worse" because you can have a
window beyond infinity, so there is room to make things even
worse.)

Most stereo cameras from the 50s set a stereo window around 7
feet from the camera.  This is achieved by shifting the film
gates relative to the lenses, essentially resulting in the same
cropping that you can do later during mounting.

Our stereo club publication (Stereogram, with "yours truly"
serving as Editor) has published a nice series of tutorials on
the stereo window.  The concept of the stereo window is
explained with words, diagrams and stereo pictures.  To
subscribe to the Stereogram, please see here:

http://home.att.net/~drt-3d/catalog/OSPSLit/

Regards,

George Themelis

=====
George Themelis, DrT-3d@xxxxxxx
http://home.att.net/~drt-3d/
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