I know there are various groups and dedicated software for this, but recently had an interest and wondered if there were any tricks to using Qimage to do them. Read the very old thread here-
http://ddisoftware.com/tech/qimage-ultimate/cross-view-3d-(stereo)-can-you-see-this/I have a variety of cards that are 3.5" x 7" with images of about 3" x 3 1/4". Some are of low quality and halftone printed, some are actual photos mounted to the cards. I'm guessing my PRO-100 could easily best the printed ones, though this is really pixel peeping at its finest if you use a magnifying viewer.
Anybody else here interested in this stuff?
BTW, I can view them easily using the relaxed method, but can't see how anybody would put up with the strain of cross-eye viewing. I've also got an antique viewer. I need to build a camera slider to do the best job of it.