The G2 is the follow-on to the original lens. The firmware on the G2 can be updated through the Tamron Tap, which is a $60 (approximate) gadget that connects to your home computer. The G2 is my "go-to" lens for everything from portraits to wildlife and landscape photography. It seems heavy but there's a lot of glass in there.

The current copyright law was enacted in 1976; in it, copyright does not have to be registered. In the 1960s, when the photos were created, copyright had to be explicitly stated and (I think) registered. Failing the location of a registered copyright for the photos, our hero can scan and distribute freely. Under the current legislation, I can copyright my personal photos without registering the copyright.

"Faur use" is allowed when explicitly permitted by the copyright owner or when properly attributed. For example, if I quote an author in my manuscript and provide attribution, that generally is "fair use." In the case we are discussing, there does not appear to be any copyright that can be located.

If the "crafty" person does not have usage permission from the copyright holder, it's a violation of copyright law. Putting the copyrighted image into a different "frame" does not constitute permission for usage. For example, the author of a copyrighted hard-copy book retains the copyright to the same material published as a paperback or e-book.

From your post, I assume that the studio was the creator of the images. Normally the studio would not seek to copyright the images of its customers. If there is no proof of copyright (on the photos) and the studio business has been out of business for 25+ years, the chances of your liability for copyright infringement are close to zero.
Copyright law specifies that any copyright is in force for the life of the original creator plus fifty years. If there is no evidence of copyright, you are free to scan and distribute as you see fit.

A very experienced professional photographer told me, "We have relationships with our cameras but we marry our lenses." This guy typifies polyamory.