P.Fn-16 is the automatic focus preset shutter release function. Enabling this function and selecting manual focus mode on the lens allows the photographer to fully depress the shutter, and
the shutter will not fire until the AF system detects that something has moved into focus. In most situations, this is most easily done with the use of a remote shutter release cord or some other method that allows the shutter to remain depressed for long periods of time.
To use this mode, put the lens in manual focus mode, prefocus on the spot that you want to photograph if something moves into focus in it, and fully depress the shutter. When a subject moves into view and into focus, the shutter automatically trips. Note that the camera is drawing power and metering the entire time that the shutter is depressed, significantly reducing battery life.
If the camera is in continuous shooting mode, the frames will continue to be exposed until either the subject moves out of focus, the camera’s buffer is full, or the batteries are exhausted.
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