[photo-3d] Re: passport cameras

[CanterMike@xxxxxxx]

The topic of using passport & ID cameras for stereo has come up again.  Gary 
Nored kindly points out the need to transpose the views.  

I would like to add that most of these cameras are built to obtain a very 
specific reproduction ratio.  US passports require the image of the head be 
from 1" to 1 3/8" (25mm to 34mm) on a two inch (51mm) square print.  Most 
"cut & paste" ID cameras are built with a final image size of only 1"x1.25" 
(25mm x 31mm), so the head is correspondingly smaller.  Most of these cameras 
are built to reduce an average adult face to this size from a working 
distance of four to six feet (1.2 to 1.9 meters).  They use relatively long 
focal length lenses and have preset focus with a fairly small depth of field. 
 Most passport cameras are built to render two images on one sheet of 
Polaroid film, 83mm x 108mm.  Most "cut & paste" ID cameras provide six 
images on the same size & type of film. 

My point to this technical essay is that their uses as stereo cameras may be 
somewhat limited.  Instant 3D portraits leap to mind, as do some 
tabletop/still life subjects, but what main stream uses would they have?

Mike Canter

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