P3D stereo mount

["nathan kreuter" <nathankreuter@xxxxxxxxxxx>]

I'm trying to make a mount for a pair of Canon QL-17 rangefinders.  Mounting 
them is straightforward enough, what i'm having trouble with is acoounting 
for error on the right and left sides of each stereo frame.  With my 
existing mount the image starts and stops at different points b/c both 
cameras are pointing directly forward.  I am aware that by "towing in" the 
lenses towards each other (1-5 degreees depending upon distance of subject) 
the error can be negated.  My problem is with the mechanical task of making 
a mount that is easily adjusted and will allow me to load film, etc.  I have 
considered doing this: mounting the cmeras on separate pieces of aluminum 
1/8" thick and the same width as the bottom of the camera, then 
countersinking holes facing each other on the inside of this aluminum, then 
putting springs in these countersinks, sandwiching the aluminum together 
with loosely tightened bolts, then driving a screw between the two plates 
which would adjust the angle of toe in by screwing in and out.  Anyone got a 
better idea/ Oh, yeah, I want the lenses to be 6-8cm apart.  Preferably 6, 
so the amount of space i have to work with is very limited.  See the diagram 
if I've confused you.

                    []   []
                    []   []
                    [xxxxx]
   left camera      []   [] right camera
   mounted here     [] O [] mounted here
                    []   []
                    []   []
                    [xxxxx]                    O-adjusting screw
                    []   []                 x-springs
                    []   []                 []-aluminum mounts


Also, Boris, sorry I'm going to miss the film festival and your exhibit, but 
I'll be stuck here in Iowa.  Any input appreciated by this 3-D novice.


nathan kreuter


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