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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: Joel Wilcox <jfwilcox@xxxxxxxxxxx>
Date: Mon, 06 Feb 2012 13:20:00 -0600
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?

> 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.)?

Joel W.

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