12MP, 16MP or 24MP for the 17-55 lens?

Started Apr 19, 2013 | Questions thread
photoreddi
Senior MemberPosts: 3,946
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Barely resolves more detail? DxOMark? Really?
In reply to pipee, Apr 23, 2013

pipee wrote:

According to DXO, the Nikon 17-55 barely resolves any more detail on the 16mp D7000 vs 12mp cameras. So the answer to OP's question is 12mp if we go by that.

In fact, most mid range zooms have higher resolution than the Nikon 17-55 if you do the sharpness comparisons on DXO's website.

http://www.dxomark.com/index.php/Lenses/Camera-Lens-Database/Nikon/AF-S-DX-Zoom-Nikkor-17-55mm-f-2.8G-IF-ED

I don't know how you can say "barely resolves any more detail" based on dxomark's scores. Increase the pixel count of the D300's 12mp sensor by 33% and you get the D7000's 16mp sensor.

Now for DXO's numbers. Increase the D300's DXOmark score of 12 by 25% and you get the D7000's DXOmark score of 15. Increase the D300's 5P-Mpix sharpness score of 5 by 20% and you get the D7000's 6P-Mpix sharpness score. So the 17-55mm lens's clearly is capable of resolving more detail than a 12mp sensor can capture. But DXO's numbers are a very rough guide at best and their numbers are a highly questionable one size fits all guide.

Take three 50mm lenses, Nikon's f/1.4D, f/1.4G and Sigma's f/1.4, tested on the D800. Every reviewer that's tested and compared these lenses have found significant differences in resolving power, with the Sigma doing better at the widest apertures and the Nikkors doing better when stopped down. Yet DXO gives all three identical scores, 32 for the DxOMark score and 16P-Mpix for the sharpness scores. That's just not good enough for me to make useful buying decisions. YMMV.

http://www.dxomark.com/index.php/Publications/DxOMark-Reviews/Which-lenses-for-your-Nikon-D800/Nikon-D800-and-standard-lens-choices

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