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[OM] Re: What is backfocus?

Subject: [OM] Re: What is backfocus?
From: Winsor Crosby <wincros@xxxxxxxxxxx>
Date: Thu, 21 Jun 2007 14:37:28 -0700
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.



Winsor
Long Beach, California, USA




On / June 21, 2007 CE, at 2:19 PM, Chuck Norcutt wrote:

>  Perhaps the lens coasts a bit while
> moving and doesn't stop fast enough when told to.  But that would also
> mean the camera body didn't double check the final focus.  Inquiring
> minds want to know more.



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