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[OM] Re: Slouching Toward Something Else

Subject: [OM] Re: Slouching Toward Something Else
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxx>
Date: Thu, 09 Nov 2006 21:36:27 -0500
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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