Nikon uses a phase detection focusing system. The reason it does not
have to hunt for focus and the reason it is so quick is that it can
calculate exactly how far the lens needs to be moved based on phase
differences to focus on the subject under the selected sensor.
Essentially, it can calculate the distance underneath any sensor from
its phase difference.
Winsor
Long Beach, California, USA
On Nov 9, 2006, at 2:01 PM, Chuck Norcutt wrote:
> I'm afraid you'll have to convince the skeptic (me) on this one. How
> can it know the distance to various autofocus points without having
> focused on each one and gotten feedback from the lens positioner? And
> even if it could do that (and I don't see how) as soon as you move the
> camera a bit the data is wrong. Convince me.
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