Actually this is a feature of all film stereo cameras. I don't have to worry about transposing
the images I get from my twinned digital cameras - left and right come out where they
should be.

If you're wondering why this happens (the lenses are in the correct position after all) it's
because the camera's taking lens turns each individual image upside down when imprinting it
onto the film. Your left and right images are in the correct segments of your processed film,
you've just got the film upside down! When you turn the entire film-strip right-side up you
reverse left and right. If you could just individually turn the separate images rightside up
you'd be able to make contact prints without a transposing frame.

And no, turning the camera upside down when taking the image won't help - this idea was
once discussed once on the P3D list!

Jim Harp