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

Started Mar 17, 2013 | Discussions thread
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Re: That's it!
In reply to schmegg, Mar 23, 2013

schmegg wrote:

Dave Luttmann wrote:

Just another Canon shooter wrote:

Steen Bay wrote:

Don't think that DxO, DPR, Photozone, etc. are wrong, but it seems that their MTF-50 results don't tell the whole story. Maybe the 7D would have a higher resolution than the 5D if using MTF-5 instead of MTF-50, but that wouldn't tell the whole story either (so maybe it would be a good idea to use both).

Exactly. In the old times, DXOmark had the whole MTF curves. In typical cases, the 5D would be better down to MTF-10 or so, and below that, the 7D would be better - just because it has a larger Nyquist frequency. They did not measaure anything below MTF-5, if I remember it correctly, because then the noise and all errors overtake.

In other words, the 5D would be better in the MTF 10-95 range, and the 7D: in the MTF 5-10 range, roughly speaking. There are lot of other variables though, lenses used, apertures, etc.

Here is a typical chart but there are no labels here. It is not clear what we are looking at.

We can scan charts til the cows come homE. In photographs, it is clear the 5D resolves less.


And it's quite simple - MTF using SFR (as DxO do) does not measure resolution. It measures sharpness.

That's why it's just simpler to look at good quality test images such as this ..

5D3 vs 7D Resolution. ISO100.

If you do the test carefully the difference is plain to see. I wish I had a 5D to do this with - the real difference would be quite staggering I suspect.

I know what you did

so much for "the crop penalty" 

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