P3D RBT cameras/ exposure spacing and size

[Jon Golden <3dman@xxxxxxxxxxx>]

Some are asking....here are answers, simplified for all to understand:

Different stereobases allow you to take different types of stereo
pictures.
The average person has eye spacing of 65mm. Therefore, a camera with
75mm
lens base gives you an enhanced (hyper) stereo effect which is good for
distance shots,  but cannot capture close up subjects as easily. 
Conversely, a camera like the S1B, with a 45mm stereobase, can get
extremely close (as
near as about 18 inches) for shooting smaller subjects, but is less
effective on distance shots.  Realist, Revere and the older standard
cameras typically had 67-71mm bases (a bit hyper) and you could get as
near
as about 2.5 feet with some of them before losing focus.

The figures given below are the number of stereopairs each camera will
take
with a roll of 36 exposure film. Most of the cameras have nonstandard
exposure spacing and therefore require hand mounting of the film chips.
The
X-B 75mm base cameras DO have standard spacing and can therefore be
mounted
by any standard slide processor.

All X-A 65mm base models produce 20  24 x 33mm pairs per roll.
All X-B 75mm base models produce 18 full frame pairs (24 x 36mm) with
standard exposure spacing, the film can be mounted to 2 x 2's with
standard
processing.
All X-C 65mm base models produce 13 full frame pairs per roll.
All S1A 59mm base models produce 15 full frame pairs per roll.
All S1B 45mm base models produce 15 full frame pairs per roll.

I hope this clarifies and cleanses the 3D minds of all who have read
this:

Regard-d-ds 
Jon Golden


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