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Re: [OM] Focus Accuracy Test - Oh what misery we bring uponourselves

Subject: Re: [OM] Focus Accuracy Test - Oh what misery we bring uponourselves
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
Date: Mon, 16 Aug 2010 17:17:03 -0400
There you go, claiming once more to have done what I said you didn't and 
couldn't do... and what I thought you most recently agreed was not 
possible.  ???

Chuck Norcutt


Ken Norton wrote:
>> I'm not sure if 5D II has poorer liveview than L1 but based on the DOF
>> calculator:
>>
>> http://www.dofmaster.com/dofjs.html
>>
>> If I set CoC to 0.006mm (35mm/5616pixel), object distance 5.5 meter, the DoF
>> is 4.74m to 6.56m. It indicates one cannot differentiate the focus between 5
>> and 6 meter, or I have missed something?
> 
> 
> Basically, the rule of thumb is that when you select a single point
> and attempt to focus in to that point from one direction you correct
> in that it is difficult to identify one focus point from another as
> they both fall within the margin of error (DoF). But if you rock back
> and forth you'll establish the points of known defocus and then be
> able to adjust to a midpoint. Somehow I managed to successfully do
> this to a greater granularity than would normally be possible.
> 
> AG
-- 
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