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Published on Jul 9, 2012
Example of the auto focus performance of the Canon T4i (650D) with the EF 40mm f/2.8 STM "pancake" lens.
Camera Auto focus was set to "Multiple" with AI Servo mode.
Raw video, straight out of the camera and uploaded to youtube
Yes that is the silent autofocus motor you are hearing when the car is not going by
Seems the camera wants to first try close-up focus and then back up and start hunting from there. Note how the lens makes small adjustments at seemingly consistent intervals, as if it is adjusting and then comparing and adjusting again, instead of going right to optimum focus like we have come to expect when shooting stills with similar DSLR cameras