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Message: <blockquote data-quote="nickt" data-source="post: 762111" data-attributes="member: 4923"><p>Ok, this is just a guess how it works, lol... I don't know specifics, but the camera camera drives the lens until the focus sensors determine perfect focus. Since the image sensor is a different path than focus sensors, focus at the image sensor may not agree with the focus sensors. So Camera calibration says get perfect focus, then take 3 steps forward. (or whatever was set). There is no feedback on this correction. I would think Nikon calibrates this way too when they build the camera. So its not a straight servo that ends in perfection. The sensors do determine focus, but then a correction of 'x' number of steps is delivered to the lens. Mechanical slop and lens calibration determines what the lens does with the correction steps sent to it. Again, this is just how I THINK it works.</p></blockquote><p></p>