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Author Topic: D800 score vs D7100 with this lens (Nikkor AFS 80-400 DX)  (Read 315 times)
kconfer
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« on: March 26, 2014, 06:02:51 AM »

<div id="linkdxomark">This a comment for <a href="http://www.dxomark.com/index.php/Lenses/Nikon/Nikon-AF-S-NIKKOR-80-400mm-F45-56G-ED-VR">this page on the website</a></div>D7100 has a smaller pixel pitch compared to a D800 and the sharpness of the lens is implied as 9 Mpix.  The D800's score is an implied 14 Mpix.

Why would a sensor with smaller pixel pitch that uses only the sharpest portion of the full frame image have an implied sharpness value less than a sensor with a larger pixel pitch?

Shouldn't the 24 Mpix D7100 show a sharper score than the 36 Mpix D800 because the pixel pitch is small and thus more pixels are on target with similar framing?

I'm struggling with this lens and want to know if it's my camera, my copy of this lens, my ability, or if I should move to full frame for sharper images.

I just can't get very sharp images with this lens and the D7100....even after AF Fine Tune.

Any information on the DX test procedure that result in a 9Mpix sharpness score for the D7100 vs a 14 Mpix sharpness score on the D800 would be greatly appreciated.

Thanks!
« Last Edit: March 26, 2014, 06:04:49 AM by kconfer » Logged
Sophie
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« Reply #1 on: April 01, 2014, 10:06:58 AM »

Hi kconfer,
Thanks for posting your question on this forum.
Please keep in mind that we do not take into account pixel pitch or image sensor size when we normalize our data. The only important matter is the number of pixels on your final images.
In the end, two criteria explain the difference between the D800 and D7100:
- pixel count difference: 36 Mpix on the D800 and 24 MPix on the D7100.
- lens limitation: the 80-400mm is not sharp enough to take the full advantage of the D7100 very small pixel pitch.

Hope this will help you.
Best regards.
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