Ah, now that's interesting...... Canon went one better than Nikon by making their system truly versatile by creating adapters which work on both their mirrorless and their DSLR camera bodies. That would really keep their customers happy!Believe it or not, there is a high demand for existing Canon EF "L" lenses, while the demand for DSLR cameras has diminished. Some of the older Canon EF L lenses are on back order at some of the major US stores, and the price of the most expensive EF L "prime" lenses never drops. The canon EF-R adapters has given a second life to the older lenses, as they can be used on both the DSLR cameras as well as the mirrorless ones.