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Re: [OM] Focusing accuracy with EMF adapters (was "Re: Iowa Zuikofest re

Subject: Re: [OM] Focusing accuracy with EMF adapters (was "Re: Iowa Zuikofest redux")
From: "C.H.Ling" <ch_photo@xxxxxxxxxxxxx>
Date: Tue, 7 Feb 2012 08:22:21 +0800
----- Original Message ----- 
From: "Joel Wilcox" <jfwilcox@xxxxxxxxxxx>


> On Mon, Feb 6, 2012, at 11:38 PM, C.H.Ling wrote:
>> All DSLR camera manufacturers have problem to ensure accurate focus with
>> different lenses, in the film age no one notice about it but the problem
>> can't hide when pixel count increases in digital age. That's why we have
>> focus calibration on the latest DSLRs. Even so I don't think it works in
>> all
>> condition, the Tamron 70-300 I had was working fine with my 5D II at day
>> time but focus shift with tungsten at the short end.
>
> That is very weird.  Photons are photons, aren't they?
>

Who knows? I had problem with E-3's AF, both my 11-22 and 50-200 have focus 
shift at the wide end, I can't explain either. They were repeatly tested for 
a hundred times.

>> I think mirrorless camera is the way to go, the focus of my E-PL1 is
>> extremely accurate even under very poor light.
>
> Can you rule out all other factors affecting IQ with your DSLRs in low
> light (camera shake, high ISO, etc.)?
>

No, because the images were clearly front focused.

C.H.Ling

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