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Manual focusing works "by wire" thus by triggering the AF motor. A focus distance guidance is provided in the camera viewfinder/on the LCD - this works quiteThere have been a few threads about the possible focus problems on some 18-55m lenses, although it seems to have gone quiet recently. It has rotary encoders for aperture and manual focus which tell the camera body what to do to control the lens. How well these respond depend on your camera.