I'm considering getting a Canon 1.4X TC II, but am concerned about compatibility.
It only works with certain Canon lenses. I assume because of clearance issues with the rear element, yes?
I also figure that, since any alt lens mounted with an EOS adapter will have MORE clearance than any Canon lens, they should all pretty much work with the TC. Is this correct?
I don't think this TC works with lenses other than Canon telephotos above 300mm.
I could be wrong about that , but the 1.4x II does have a protruding front element that won't allow it to be used with our alt glass. At least the shorter ones, maybe telephotos are different.