*** 5Dc vs 60D resolution test ***

Started Mar 17, 2013 | Discussions thread
Steen Bay
Veteran MemberPosts: 6,264
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Re: relate
In reply to schmegg, Mar 19, 2013

qianp2k wrote:

Mako2011 wrote:

Steen Bay wrote:

schmegg wrote:

Sharpness and resolution are not the same thing! But you use them interchangeably!

Well, don't almost everybody do that?

No. They define the two very differently and explain how the relate to each other.

Actually DXOMark uses the two words interchangeably but they don't mean acutance. DXOMark's P-MPix is based on MTF data.

I'm sorry Peter, but you are wrong. And, in DxO's own words ...

"The MTF precisely describes the contrast attenuation: for each spatial frequency, the MTF plots the ratio of the output modulation versus the test object modulation."

In other words, it's an acutance test.

And DxO very rarely use the two words interchangeably, as they are not the same thing. You will notice that they P-MPix score is a measure of sharpness, not resolution!

In fact, on their Measurements tab, there is no resolution results either - just sharpness.

Yes, they call it 'sharpness' now, but think that they called it 'resolution' before the P-Mpix score was introduced. Sounds wrong to say the "the sharpness is 47 lp/mm", and they also say that "the DxO resolution score shows sharpness performance.." (about/lens scores).

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