[photo-3d] Re: Vertical drift

["John Goodman" <jgood@xxxxxxxx>]

Paul Talbot wrote:

> ... Kodak Stereo cameras have perfect vertical registration
> and do not experience the drift problem that exists in other
> 1950s stereo cameras. 

I haven't shot with a Kodak yet, but every roll from the stereo 
cameras I've used, current production or decades old, has 
required vigilance when mounting. There may be a number of 
shots in a row that have practically identical vertical 
registration, but there are almost always exceptions within a 
roll. Afterall, we're talking fractions of a millimeter. Even if the 
film path were extremely well constrained in the camera (a la 
the Iloca Rapid), there are probably slight variations between 
film companies. A few hundredths of a millimeter's difference 
could result in significant savings for a manufacturer over the 
long haul, and perhaps still be "within spec". However, no 
matter which film is used, there's usually some degree of play 
within a given camera's film guides, not to mention a certain 
degree of slop in cartridge positioning and the film take-up 
spool. A system with *no* vertical drift would be amazing.

jeg

 

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