You're mistaking something you can do already with making it automatic. 
This  seldom works as well as it would manually.

Bob Shell wrote:

>On Sep 25, 2006, at 3:27 PM, P. J. Alling wrote:
>
>  
>
>>It's not needed.  But they have the software to implement it  
>>somewhere,
>>it's probably a fast efficient algorithm, so they added it to the  
>>camera
>>to get a bullet point no one else has, rather than design in something
>>actually useful.
>>    
>>
>
>I think it could be very useful when shooting events and needing to  
>verify that faces are in focus quickly.
>
>Bob
>
>  
>


-- 
Things should be made as simple as possible -- but no simpler.

                        --Albert Einstein



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