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Message: <blockquote data-quote="nickt" data-source="post: 241580" data-attributes="member: 4923"><p>You probably don't have to actually lock it, but its best to lock it. It needs to be at max though. You are not really locking into that f stop, just locking the ring. The camera will control the aperture (or you will manually from the camera). It just needs to know the ring is set there for whatever reason. Probably because setting that ring anywhere else would physically limit the camera from controlling the aperture properly.</p></blockquote><p></p>