I just don't see how one could find a novel and non-obvious way of doing it in 2010s.Mt Spokane Photography said:Its all about the manner in which the speed change is done without adding a additional contact as was required in the previous patent. Since the existing lenses must work with it, the method of detecting and switching is what sets it apart.Kit. said:Actually, I'm surprised that negotiation for higher speeds done at lower speed of the same serial protocol is patentable at all.
But probably the goal of Canon was not to provide a novel solution to speed negotiation "problem", but to keep its communication protocol patent-protected so that the 3rd party lens manufacturers would be unable to implement its coming extensions.
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