Return of Interesting article on DxO about 5D III and D800...

Started Apr 10, 2013 | Discussions thread
KLO82
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Re: Return of Interesting article on DxO about 5D III and D800...
In reply to Steen Bay, Apr 13, 2013

Steen Bay wrote:

qianp2k wrote:

Steen Bay wrote:

aftab wrote:

Now, let us look at scenario B and scenario C again. In both cases A looks sharper than B. What does that mean? More resolution = more sharpness. That is resolution = sharpness in this two scenarios. And almost all scenarios are like this. So, we can actually use the terms resolution and sharpness interchangeably.

But if comparing for example the 12.7mp 5D vs. the 18mp 7D, then things get a bit more complicated, because it seems that 5D (most often, with most lenses) has the best sharpness (MTF-50?),

true.

while the 7D has the highest resolution (MTF-10 or MTF-5?).

Not necessarily. Actually with most  EF lenses 5D outresolves 7D if you frame them in the same AOV (as tested by DXOMark in either old MTF or new P-MPix unit that are two different expressing units but with the same result). Only very few lenses such as with 300L/2.8 IS II 7D/60D outresolves 5D.

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But what if we could compare the MTF-10 er MTF-5 values (which we unfortunately can't anymore)? Then I think that the 7D would win, because it has quite a bit more MPs.

This is what you are talking about:

In the 2nd pic, I was supposed to highlight the MTF 20, but instead wrongly circled the MTF 30. Dxo used MTF 20 as resolution ("critical" resoltion or something like that. I cant remember the exact term).

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