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Look closer at the D800 sample. There is no lens degradation, only sensor extinction at the single pixel level!
I think this is a well supported (technically) article... note that the comparison is on resolution only... no DR, or color depth or other aspect of photography, which surely doesn't benefit from smaller pixels... http://nerdycamerablog.blogspot.gr/2012/09/resolution-comparison-nikon-d800-vs.html Note that the result is that "there cannot be more benefit from resolution increase (D800 - 36mp is the limit for FF) on current imaging areas, unless there will be a further improvement in lens resolution from the best of current lenses". The article also concludes that Sinar 75 MFDB (33 mp) has (a little) more resolution than D800....
The Star Pattern shows that only at the limits of pixel resolution does the image get degraded.
I have used Bart's resolution target with my D800 and the 24-70 f2.8 lens combo and I fully agree with his conclusions. The lens is not the limiting factor for the resolution....That's correct. My resolution tests of D800 and D800E files, and those made by others using my test target show that the resolution is mostly limited by the sampling density, not so much by the lens (assuming a decent lens). In fact, a higher resolution sensor will pull more resolution out of a given lens, due to how their combined MTF responses add to a higher modulation at the highest spatial frequencies.
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The star-target test shows that resolution usually approaches the Nyquist frequency limit to within a few percent, sometimes even all the way to Nyquist. That's the physical limit that the sensor imposes, the lens has some more resolution to spare. Of course, a better lens will raise the MTF response over the entire range, and have better corner performance, but the sensor resolution sets a physical limit for the system performance.
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But the sensor is.... for instance, an 80mpx MFDB shot in single shot, has less than a third the resolution that a multishot MFDB of the same pixel count bares... Let alone color accuracy and the more than 2 stops (!!!) of DR....I have used Bart's resolution target with my D800 and the 24-70 f2.8 lens combo and I fully agree with his conclusions. The lens is not the limiting factor for the resolution.
But the sensor is....
for instance, an 80mpx MFDB shot in single shot, has less than a third the resolution that a multishot MFDB of the same pixel count bares...
Let alone color accuracy and the more than 2 stops (!!!) of DR....
Hi Bart,Hi Theodoros,
That's exactly what Cem said, as do I. We agree on that.
Which again proves that the number of sensors/samples taken is what really determines the resolution (assuming a decent lens is used).
The color resolution is indeed higher with a multistep sensor assembly, but I doubt Canon will come out with that feature in a new model. The improved DR is questionable, most Medium Format manufacturers quote the bit depth of their AD converter circuits, but that doesn't necessarily translate into actual DR.
Cheers,
Bart