Pan F+ to the rescue.
I'll have to check some slides to see if they support your conjecture.
Sounds like the lenses have a lot of separation which would make an exaggerated stereo image. My wife has contacts, one is for reading and the other is for distance. It took a little getting used to but her brain fixes the focus so everything looks correct.
VERY COOL! A gem for sure. A viewer (at the right price) sounds essential!
Separation is determined by the format. Realist format cameras all have 72mm lens separation (15 perforations along 35mm film). Human eyes have about 63mm separation. Realist cameras give natural looking stereo for main subjects about 2-4m away. For distant subjects, you want hyper stereo, so many enthusiasts use a single camera and move it quite a lot between shots. For macro, you want less separation than eyes, so many enthusiasts use a single camera on a macro rail perpendicular to the subject.
View-Master, the separation is about the same as your eye.
For the consumer camera, it is -- but many of the commercially produced disks have hyperstereo images. For instance, a stereo photo of the Grand Canyon shot with lenses 2.5 inches apart (roughly the average interpupillary distance) would look as flat as a regular photo (except for foreground objects, anyway). Move the two lenses several yards apart, though, and you get reasonable depth on objects a mile or so distant.
the 3D effect is lost beyond about 30 feet.
Sorry it took so long but I finally located my 1964 3D slides from the Stereo Graphic and got a few under the microscope. Bottom line, one side is much sharper, in say, the 4 to 8 foot range, and is good at longer distances. The other lens is very sharp at distance. Never really noticed it using a viewer.
Viewers and stereo slide mounts in Realist format are currently produced I think.
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