Back in college I had to use stereoscopic air photos often enough that I taught myself to view (most) stereo pairs in 3-D without using a viewer. It's not too hard.
In the 90s I bought a Loreo 3D camera -- mine was marketed under the Argus name -- and had a lot of fun with it. I got 3D pictures of the kids on swing sets, flying kites, etc. It was discontinued long ago, but there are still some references on the web.
https://www.stereoscopy.com/reel3d/loreo.html