My last sentence was inept. What I wanted to say was that the next
stage might be the ability to calculate how the lens elements are
coasting in the particular lens being used. It could be doing that
all ready within a narrow range so that a severely out of spec lens
will throw it off, but I think not.
Winsor
Long Beach, California, USA
On / June 21, 2007 CE, at 2:37 PM, Winsor Crosby wrote:
>
> It does not check final focus. People hated that with the lens
> hunting back and forth with early AF and with the limited control of
> digital point and shoots. Modern AF calculates how far out of focus
> it is and directs the focusable part of the lens to move to a
> calculated position where the lens will be in focus and it takes into
> account how much things will coast. Maybe the next stage of design in
> this stuff is not to require the lens to be operating at
> specification, but for the focus control computer to calculate the
> focus for each lens as it is being used.
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