I'm not sure where you came up with that CoC number. It's incredibly
tight at about 5 times what's required for a good 8x10 print. But it
does serve to demonstrate the point. Even at extreme resolution the DoF
exceeds the 5-6 meter range.
Chuck Norcutt
C.H.Ling 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?
>
> C.H.Ling
>
> ----- Original Message -----
> From: "Ken Norton" <ken@xxxxxxxxxxx>
>
>> As to the 5D Mk2's live-view--it is my understanding that this camera
>> doesn't use all pixels for live-view and skips pixels. This, again,
>> would get you in the neighborhood but is anything, but exact. To
>> differenciate a focus point at 5 vs. 6 meters with a "normal" focal
>> length, the difference with most lenses is a whisper of a nudge. Like
>> C.H. says, 0.5mm or so. The problem is that wide-open, there is
>> usually just enough CA or other issues with the lens which prevents
>> precise focusing to this level. As mentioned, stopping down the 24mm
>> F2.8 lens to F4 acually make precise focusing more feasable. The
>> line-pairs on the usaf lit up like a Christmas Tree when in focus. I
>> could conclude, therefore, that it is possible the L1 has a superior
>> live-view than the 5Dmk2.
>
>
--
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