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Message: <blockquote data-quote="mo.childs" data-source="post: 578760" data-attributes="member: 42264">The sensor in the camera measures whether focus has been achieved either by contrast detection on the sensor or by phase detection it passes this information and the direction to move the elements to the lens motor if the lens has a motor if not it uses the camera body motor to move the lens elements. I suppose it depends on what you think autofocus means. I think it's a system with feedback which involves the lens and the camera body but the body is the brains.Sent from my Nexus 6P using Tapatalk</blockquote>