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Re: [OM] Back focusing

Subject: Re: [OM] Back focusing
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
Date: Mon, 04 Oct 2010 18:23:14 -0400
This is how Canon autofocus works
<http://www.fredmiranda.com/forum/topic/241524>
No guarantee that Oly works the same way but I'd bet it's similar.

Chuck Norcutt


On 10/4/2010 11:04 AM, jjohnso4@xxxxxxxxxxxxxx wrote:
> Ian Nichols wrote:
>
>> How does this happen?  surely it's a closed-loop system, i.e. focus
>> sensor detects that image is out of focus and adjusts lens until it's
>> in focus
>
> Hi Ian,
>
> The Canon AF systems are not closed loop and I doubt that Olympus is 
> different.  I suspect that a closed loop system would degrade focus tracking 
> to an unacceptable level.
>
> Later,
> Johnny
> ------------------
> Johnny Johnson
> Cleveland, GA
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