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Message: <blockquote data-quote="nickt" data-source="post: 726168" data-attributes="member: 4923">For a stationary subject, you must release the button when you recompose. Otherwise it will instantly refocus on whatever the focus point lands on after recomposing. Think about what I called it above: "Power assisted manual focus". You are in control but you have the motor and the camera's sensors to help you achieve a 'manual' type focus on the object of your choosing.For tracking, you can hold the button continuously. No need to release it, just click the shutter when ready. But you could release it if you wanted too. When I shoot macro, I usually hold the button down forever. The continuous focus keeps up with my wobbling. But sometimes, I take focus and release the button then I wait for my wobble to bring the bug into best focus and trip the shutter. I use it very much like I would use manual focus, but with some help from the camera.</blockquote>