Re: Stereo base in macro

[P3D Jim Crowell <crowell@xxxxxxxxxxxxxxxxx>]

At 8:07 PM 7/13/96, P3D Jamie Drouin wrote:
>
>        "Is the 1:30 stereobase rule mainly geared for use on subjects
>within an average viewing range, such as 3ft to 20ft, or is it meant to be
>applied to macro subjects as well?  The reason I ask is that I have
>continually found a larger stereobase more beneficial for macro work, and
>wonder if there was a specific curve which anyone has found to account for
>this correction.  In other words, is there another rule which takes over at
>a certain subject distance."
>

John B. derived a fairly general equation a while back that
specifies the stereobase as a function of the taking lens focal
length & near & far distances in the scene, but I'm afraid I
can't dig it up. John?

It was derived under the assumption that the goal is to keep the
maximum on-film disparity below some critical value.  As I
recall, it doesn't take the viewing situation into account.  But
then, as we all know, these discussions of non-ortho situations
give John the heebie-jeebies & he only gives us these equations
out of a sense of civic duty.  ;-)

-Jim C.


------------------------------------------------
Jim Crowell
School of Optometry
360 Minor Hall
University of California
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(510) 642-7679
jim@xxxxxxxxxxxxxxxxx
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