stereograph splitter for Polaroid pack cameras

This attaches to a Polaroid pack camera (100-400 series with a bellows) and splits the image into two images which can be viewed through a stereoscope. Print with black filament (this was printed grey, but I had to blacken the light path to reduce reflections) with supports, then cut a strip of 2mm thick glass mirror into a strip 36mm wide. Cut two pieces 35mm long, two pieces 32mm long, one 23mm long and the last one 28mm long. Sand/grind 45 degree angles into the 32mm pieces on the long edges cutting into the mirror surface so that they engage at 90 degrees with the mirrors facing out. Apply contact cement to the 6 mirror surfaces on the splitter and the backs of the mirrors. Mount the middle mirrors so the 45 degree angles engage and protrude out of the splitter. Try to mount the mirrors in the channels on the bottom as guides as they have to be mounted precisely. Mount the two 35mm pieces on the opposing mirror mounts with the mirror protruding the same amount as the middle mirrors at the 90 degree angle. Mount the 23 and 28mm mirrors for the electric eye. Install the top with the pins as guides (may need some sanding), then install the front piece so the lens mount is over the middle mirrors. Push it on until it bottoms out to make sure it's square. The viewer uses two rear lens elements from a pack camera and has a pupillary distance of 62. You may need to modify it for your eyes. If you don't have any extra lenses, you can use any VR viewer that has been adjusted to your pupillary distance. This adapter loses around 2 2/3 stops of exposure so you will need to compensate for that by either using manual exposure, or setting the exposure all the way to lighten (which won't be quite enough compensation) if using auto exposure. The sample photo was taken with a camera converted to Instax wide. Try viewing the photo with VR lenses or the included viewer with Polaroid rear lens elements.