I have trouble seeing stereo images, but my father was quite a fan of stereo foto. He had several cameras. Sometimes he would accentuate the 3-d images when taking landscape fotos by alternately closing off one of the lenses while walking to a point farther to the side of the first image.

I may have saved several of his cameras from the fire that destroyed my house, and may be interested in selling them. Possibly the film type they used is nolonger availbe, and may have gone the way of the Kodachrome....

He used to be a member of a stereo club that would send their stereo slides around to all the members, and critiquing the images. They called this a round robin...

i used to have a stereo card viewer as well as a slide viewer for stero slides..
here are some links..
http://en.wikipedia.org/wiki/Stereoscopy
http://www.stereoscopy.com/