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Canon C100 is very popular with run-and-gun operators in the documentary world, and Canon recently announced an upgrade for the C100 that allows for continuous tracking autofocus with Canon's entire EF lineup. The upgrade will also increase the speed of the camera's existing one-shot autofocus by around two times and provide an AF lock, which will enable the user to change the image framing while keeping the desired focus point, a feature that is especially useful for run-and-gun filmmakers.