This system involves a system of mirrors or prisms which fit in front of the normal lens of an SLR, and "split" the film into a left and right version. A model using mirrors operates like this:
A similar arrangement is built into a viewer used to view either the slides or prints produced, or the images may be free-viewed, parallel viewing method).
Equipment available (new or used) using this principle includes the Ukrainian-made SKF-1 beamsplitter, the Franka beamsplitter, a 35mm attachment made by Pentax, and the Loreo camera.
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