P3D Stereo Base Calculators

[Bob_Maxey@xxxxxxxxxxxx]

>>But my wish has been for a circular calculator wheel,
>like the proportional scales used in printing and art.  Align near
>distance on the inside wheel with far distance on the outer wheel (up
>to infinity?) and read the maximum base - or a range of bases -
>through a little cut-out in the small wheel.  A given wheel would
>assume one format/maximum on-film deviation (1.2mm for 35mm).  Don't
>know if one wheel could have answer several windows for different lens
>FL's or if it would be one focal length per wheel.

A similar device was illustrated in the 1974 issue(?) of American
Cinematographer, and I have seen references to a similiar item in the
literature. I would be also be interested in seeing something like this.
The device was designed for adjusting Interocular between 2 movie cameras
and at the time, I recall that it was for 35MM cameras. It also took into
account adjustements of mirror when the cameras were too big to move close
together for close-up stereo photography. This was mentioned specifically
in the article because two Mitchells in sound proof blimps are far to large
to put side by side.

There is also a company that rents a handheald stereo computer, but I am
not sure of its features or if it is something one can buy.

RM



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