Sounds like something I need to study.
Chuck Norcutt
Winsor Crosby wrote:
> 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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