Unfortunately, Canon already "obsoletes" lenses costing many thousands of dollars to purchase.YuengLinger said:Yes, this is speculation, mostly for fun. Not meant to raise anxiety and hackles, but at SOME POINT, somebody will be the last person to pay full price for a Big White or other L series ef mount lens, only to see it obsolete before the warranty runs out.
I predict that the ef mount, introduced in 1987, has considerably less time ahead than behind.
As far as the EF mount goes, unless there is a paradigm shift in sensor size, f stop requirements or the electronic stuff that goes inside of an EF lens, there is no reason for Canon to introduce an EF mount replacement. Canon has already demonstrated that the EF mount can handle an f stop of 1.0, so unless something wider than that is needed, why change?
All EF lenses will work (natively or with a Canon made adapter) on all Canon interchangeable lens cameras currently made.
Unlike Nikon, any EF lens made since 1987 can work with any Canon EF mount body without any asterisks. The only lens feature that won't work using a current lens on a pre-1V body is IS.
Canon has billions of dollars invested in "full frame" sensor production. Changes there are not likely.
Whenever Canon decides to release a "full frame" mirrorless camera, I believe that it will follow the current Sigma sd mirrorless camera design philosophy with respect to the flange distance: it will be the same as the current "full frame" DSLR's.
The team behind the design of the EF mount had a tremendous amount of foresight (or luck )- their work has been able to remain current and competitive since the release in 1987. Design work certainly started 3 to 5 years prior.
It isn't going away anytime soon.