I believe that Canon's innovation will change the entire industry! This is great news for us! I am sure that all the 3rd party manufacturers will eventually introduce their own versions of the built in 1.4x and 2.0x teleconverters.
I can just imagine:
The Bigma 50-500mm lens with built-in "dual" 1.4x and 2.0x teleconverters! The "dual" teleconverters will work independently of one another so that one or both can be used at the same time.![]()
Same idea I had. If Sigma could do a 200-500mm F2.8, somebody could do well with a 500mm F2.8 prime with both 1.4x and 2x extenders integrated into the lens. You get:-
500mm F2.8
700mm F4 (using 1.4x)
1000mm F5.6 (using 2x)
1400mm F8 (using both 1.4x and 2x)
and AF will stlll work for one-series bodies for all combination.
