@preferred @IngridHbn
I have a couple of small 40mm focal length lenses and must stick them up as a viewer.

Also a pair of DSLRs bolted together.

Thus far I've played a little with the anaglyphic way of making 3D images, show the left camera image in red to the left eye, and the right camera image in cyan to the right eye.

Bit of a curiosity for most subjects, but entertaining.