[photo-3d] Re: Camera separation in stereo photography

[Abram Klooswyk <abram.klooswyk@xxxxxx>]

Sergio Baldissara (29 Jun 2000):
>Fusion capacity physiologically varies between individuals: 
>some skilled stereo watchers are even able to freeview 
>stereocards in parallel format.

I don't believe the ability to freeview is the same as, or 
even related to, the capacity to view large convergence 
differences. These are essentially different skills.

don lopp (28 Jun 2000): 
>I think  the deviation numbers given are erroneous or being 
>measured in a strange way  ? 

The strict definition of deviation is something like: 
The Deviation of a pair of homologues on a stereo picture is 
the difference between the infinity separation on the stereo 
picture and the separation of that pair of homologues.

In looser usage, for the infinity separation (which is often 
not measurable) the far point separation can be substituted.

In the stereo base discussions often the deviation of the mask 
aperture is used. Its separation is easily measured on the 
mount, and it is mostly known already. Then only the 
separation of infinity homologues or of far points have to be 
measured to compute the mask deviation on the mounted slide 
(or card). This is often the largest deviation of the slide, 
unless something gets "through the window.

Hardly any errors can occur in my opinion (if we stick to the 
right terms :-)).

Abram Klooswyk

BTW: Can replies to posts please quote only the necessary, not 
whole messages?