APS-C IMAGE QUALITY VS fULL fRAME AT TESTING

Started Feb 24, 2013 | Discussions thread
Donald Duck
Donald Duck Regular Member • Posts: 308
Re: APS-C IMAGE QUALITY VS fULL fRAME AT TESTING
1

schmegg wrote:

Donald Duck wrote:

schmegg wrote:

The only way the determine which sensor is capable of resolving more detail is to present exactly the same image detail to both and then compare them at 200% or 300%. Any other approach is flawed when trying to determine resolving power.

How come nobody ever presented enough detail to the 18mp Canon sensor so that it could fall just 8% short of the 21mp 5D2 one? Let me guess - wide spread FF conspiracy? Every possible measurement shows considerably more than 8% advantage.

Examples (all in the center)

here (about 25% advantage)

here (about 40%)

here (about 35%)

It must be different processing, right? Wait... what about

this (about 18%)

Those are acutance maps - they don't measure resolution!

They do. The measure the whole MTF range. They call the MTF-5 figure resolution but they say that this is hard to measure and too sensitive to noise. They used to present the MTF-20 figures as a measure for resolution but now they decided that they need to scramble the data. PZ measures and reports the MTF-50 data on processed file. DPR, which uses the DXO data, labels the graph "Sharpness". All those fancy words that you (and now, DXO) use are just different MTF values.

But that is not the main point. You are in denial about the enlargment factor and its role in the measurements and in what we see in reality. You never agreed that this was a factor, with the same or a similar lens anyway.

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