On Sat, 24 Feb 2001, Alan Chan wrote:
> Interesting. Maybe continuous autofocus is not the same as predictive
> autofocus.
It's not. Continuous autofocus means that the camera will autofocus
continually (surprise, surprise!), and when you press the shutter button,
it will focus on the last position that it had time to focus on. If the
object moved in the split second between the pressing of the shutter
button and the moving of the shutter curtains, too bad... it might be a
bit out of focus. Predictive autofocus is a way of accounting for subject
motion in that intermediate fraction of a fraction of a second. When you
press the shutter button, the camera focuses not necessarily where the
object is, but where it calculates that it will be by the time that the
curtains get around to moving, based on its velocity and vector.
chris
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