Lens Mounts

Lens Mounts No Longer Matter
Metabones T Smart Adapter Mark IV for Canon EF or Canon EF-S Mount Lens to Sony E-Mount Camera
Yes, I know.... hegemony isn't a word that we use every day, and writing that "Lens Mounts No Longer Matter" is somewhat provocative. But, hear me out.
In the first half of the 20th Century there were a few different lens mounts for 35mm cameras,  some of which were non-proprietary and eventually all of which outlived whatever patent protection they may once have had.
But with the advent of electronic mounts, beginning in the 1980's, the mainstream bifurcated, with Nikon and Canon electronically coupled mounts becoming predominant. With the advent of ubiquitous autofocus most photographers eventually became locked into one mount or the other. Occasionally, out of either boredom or sometimes need, photographers would switch mounts and brands. This was always a very expensive proposition. Indeed, once one had bought into a system, this usually meant sticking with it...