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

Started Mar 12, 2013 | Discussions thread
Great Bustard Forum Pro • Posts: 41,906
Even better this time.
2

nedelcho wrote:

Ok, thats why I've made another test in equal light of the same scene and with f/4 and f/5.6 apertures. I the photos once again show that 60D has more resolution, so you are wrong too. Until you've made the same test (with your supposedly right settings) and post it here my test is more valid than yours. I have access to test charts also and again the 60D will have an advantage. Here is the test scene again. I also made available the RAW files in this post http://forums.dpreview.com/forums/thread/3398807?page=3#forum-post-51030488 .



But lets pretend for a moment that I am wrong. If 60D does not have more resolution than 5D why do we need more than 12MP then. If Canon release 46MP body it will have nearly the same resolution as 5DII. What is the point then.
You seems to follow what DXO finds blindly. First you claims that "any" lens will give more resolution on higher MP body. Now suddenly after DXO publish their P-Mpix rating you say that they are right and some lenses maaaybe have more resolution. What's up with that. You are not consistent.
Latter in the day, I will post the RAW files of the same scene for all apertures from f/2.8 to f/11, both for 60D and 5D. But it is obvious already. 60D has more resolution and you can not deny it without making fool of yourself.

Yes -- a nicely done test on this one, and, yes, I agree that the 60D resolves more detail.  As I've said:

http://www.josephjamesphotography.com/equivalence/index.htm#lensvssensor

In short, the resolution as a function of sensor size and pixel count can be summed up as follows:

For a given lens sharpness, the difference in resolution (lw/ph) between two systems will be between the ratio of the sensor heights (enlargement ratio) and the ratio of picture height in pixels (linear pixel density).  The sharper the lens, the closer the balance will be to the ratio of linear pixel density, the less sharp the lens, the closer the balance will be to the enlargement ratio.

and the 24-70 / 2.8L II is sharp enough to where the balance favors the system with more pixels.  Is the difference "significant"?  In my opinion, no, it is not, for the photos you have presented.  But that is another matter all together.  The fact of the matter is that if the lens is "sharp enough", the difference in pixel count matters more than the difference in sensor size in terms of captured detail.

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