With apologies to John I. Koivula I thought that the Nikon SMZ 10 trinoc (not SMZ10A) was the only stereo scope that could shoot a stereo pair without having two cameras.
Now I see this manual on ebay. That scope is the American Optical Cycloptic which was sold on early Gemolites and had an apochromatically corrected objective. One of the first copies of the Zeiss stereo. Great scope. (one of my very first loves
) And here is a manual, for an accessory for it, that I never even knew existed.I guess nowadays, with ocular cameras getting so small, one could just stick two of them, onto almost any stereo scope, and accomplish the same thing digitally.
Two HD cams and a pair of shutter goggles. The in between hardware and software might take a little doing but I think that is all coming down in price.