Re: [photo-3d] Base Calculator

["Dr. George A. Themelis" <drt-3d@xxxxxxx>]

Hello Joseph,

I believe this question is answered in one of my Tutorials
(which you said you were going to buy but I have not
seen the check yet :) :) :))

The 1.2mm is what is considered the maximum allowable
stereoscopic deviation for 35mm film.  It is constant and
independent of focal length.  It is not given by any
authority above humans, neither calculated via quantum-
mechanics.  It is a conventional choice.  No one is
going to die if a stereo pair has more than 1.2mm
deviation.  It is there to protect you from putting
too much in a stereo pair that will make it difficult
to view in a viewer or project (especially project).
Notice, this is maximum.  You can use less, no problem.
>From your 2d days you are used to p = 0.

George Themelis

===


> Now the real reason for posting this message. Being new at Stereo can anyone tell me if p=1.2 is actually a constant to be used
for all lenses, or does it change somewhat with focal length?  How was p arrived at? Is it a true calculated value or an empirical.
Was it derived from astronomy? If it changes with FL how so? I cannot see how it could increase linearly at the slope of my focal
lengths otherwise b would always be the same. Or does p actualy decrease as FL increases? How about it you experts?
>
> Joseph F. Valvo