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Step 12What's going on?
The mirror and beamsplitter are about 2.5" apart. That's an average distance between an adult's eyes. The mirror is reflecting what your right eye would see into the photo. The beamsplitter reflects 50% of what's in front of it and let's 50% through to the camera lens, so you get equal amount of the red and blue images.
The filters are allowing the red part of the spectrum into the part of the photo that your right eye would be seeing and the blue filter is only allowing the blue light into the part of the photo that your left eye would see. When you view the photo, you don't want your right eye to see the left eye (blue) image, so you erase it by placing the same blue filter in front.
The filters are allowing the red part of the spectrum into the part of the photo that your right eye would be seeing and the blue filter is only allowing the blue light into the part of the photo that your left eye would see. When you view the photo, you don't want your right eye to see the left eye (blue) image, so you erase it by placing the same blue filter in front.
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These were first designed in the Victorian era when stereoscopy was far more popular - so they should be patent-free now :-) (A quick Google found this example: http://www.toutfait.com/issues/issue_3/Multimedia/Shearer/Shearer10.html - there are more...)
Personally I prefer the Holmes Card viewer which uses prisms to converge the images and lenses to refocus your eyes at infinity for (slightly) more comfortable viewing. (My own examples are here: http://www.gtoal.com/stereo/ )
Regards
Graham