Shocking insight: AF is not a closed feedback loop!

Started Jul 18, 2003 | Discussions thread
DavidP Forum Pro • Posts: 29,088
sorta closed-loop ?

Doesn't this, in effect, make it a semi-closed loop?

I simply can't imagine the lens being told "move 13 steps" and it then moves 13 steps, without a final "OK, now how far should I move?" step in there.

Mishkin2 wrote:

This talk may happen several times during focusing procedure,
though - in case, for example, camera moved since the focusing
began but before it locked. This also helps AF sensor to gather
more data and tell the lens: "Did I say -12.5? I meant -12.54" at
the last moment before it shouts "Stop!".

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