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Author Topic: Confusing results for “Standard Zoom Lenses”?  (Read 831 times)
AndyG
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« on: March 13, 2013, 09:07:31 PM »

This a comment for this page on the website
You indicate the Tamron “with a sharpness score of 13P-Mpix, beats the Nikon” yet the Nikon scored 15P-Mpix. Isn’t the Nikon’s higher number better?

Also reviewing your “Lens Metric Scores” in the same “Standard Zoom Lens” Category, the Sigma 24-70mm beats the Nikon in almost all of your tests  ... for Sharpness, Transmission, Vignetting & Chromatic Aberration (and ties the Nikon for distortion) yet the Nikon has a much higher score of 28 vs the Sigma’s 23. How is this possible?
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Tommo
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« Reply #1 on: March 14, 2013, 10:43:38 PM »

yes that has me confused too..then they go on to say that the sigma scored 26 in the Chr measurement....but doesn't the Nikon do even worse ta 30 ??
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Emilie_DxOMark
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« Reply #2 on: March 15, 2013, 06:53:24 PM »

Hello,

Thank you for your interest in DxOMark.

Sharpness and Dxomark score differ slightly when considering sharpness in the field. The sharpness score tolerates a loss of sharpness in the corner when DxOMark score does not.
If you take a look to the sharpness in the field for these two lenses, you will see that the Sigma lens loses some sharpness in corner hence the DxOMark score comparison.

Best regards,

The DxOMark team
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