Resolution test, between crop (18MP) and fullframe (12.8MP)

Started Mar 12, 2013 | Discussions thread
Great Bustard Forum Pro • Posts: 39,909
Re: The test was performed properly.

ultimitsu wrote:

Great Bustard wrote:

Well, it was almost done properly. ...

You are looking at this test as how it emulates real world situation, I agree it can. But it was not set out to merely do so, it is set out to disapprove the theory that " with imperfect lens, at some point, 5D1 will out-resolve 60D." To that end, it is done completely wrong.

Ah.  I was unaware that the purpose of the test was to prove that the 5Dc would outresolve the 60D at some point.  Yes, it did fail in that purpose, as the test showed the opposite (though insignificantly so, in my opinion).



To prove this argument wrong, you need to shoot with identical imperfect lens. The test is wrong because 24-70II is quite close to a perfectly, made worse by it was less perfect on 5D than it is on 60D due to aperture difference.

All systems suffer the same from diffraction softening at the same DOF, but all lenses do not suffer from the same aberrations at the same DOF.

My view is that at F11 even without diffraction consideration, lens resolution power is reduced by virtue of so much information now passes through a much narrower section of glass.

There's no danger of photons colliding, even through very small apertures. 

Given how many landscape photographers are shooting at even f/16 on FF, it is ingenuous to cry "foul" for this particular test.

Just because people shoot F16 does not mean F16 is fine for the purpose for this test. People shoot F16 because for some scenes they must use F16 - the lens is far from perfect but the shot requires. What we are dealing here is whether 60D received unfair preferential treatment than 5D1 in what is purported to be a test.

The 60D did not "receive unfair preferential treatment".  Perhaps you were looking for photos of a flat surface shot at the sharpest aperture of the lens at the optimum focal length from the optimum distance to prove something or other?

This test is what one would call "rubbish in rubbish out".

Rather, it is a good example of a comparison of a deep scene at the same DOF.

It is a good example of a comparison of a deep scene at the same DOF, if comparison of a deep scene at the same DOF was the purpose. But it is not the purpose. For its purpose ( disapprove the theory that " with imperfect lens, at some point, 5D1 will out-resolve 60D."), it is "rubbish in rubbish out".

Let's just say that the photos are a decent demonstration of the resolution differences between a 5Dc and 60D for a scene with a relatively deep DOF.

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