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Author Topic: Comparison with dpreview  (Read 2664 times)

Offline fourthird

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Comparison with dpreview
« on: June 12, 2013, 12:47:17 pm »
This a comment for this page on the website
Have a look at the dpreview preview. The huge difference in the corner (in favor of the Ricoh) is absolutely not mentioned in the DxOmark analysis. This compromises the impartiality of DxO or method used or constructing of scores.

http://www.dpreview.com/previews/ricoh-gr/9


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Fourthird

Offline cokwalon

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Re: Comparison with dpreview
« Reply #1 on: June 12, 2013, 09:25:12 pm »
<div id="linkdxomark">This a comment for <a href="http://www.dxomark.com/index.php/Lenses/Camera-Lens-Database/Ricoh/Ricoh-GR-Lens">this page on the website</a></div>Have a look at the dpreview preview. The huge difference in the corner (in favor of the Ricoh) is absolutely not mentioned in the DxOmark analysis. This compromises the impartiality of DxO or method used or constructing of scores.

http://www.dpreview.com/previews/ricoh-gr/9


Best regards,

Fourthird

No surprise here, DPreview test is flowed. They actually admitted to it, but still didn't remove the images. DPreview is extremely biased toward the GR. I would not trust them!

Offline fourthird

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Re: Comparison with dpreview
« Reply #2 on: June 12, 2013, 10:58:29 pm »
Can you explain ? the images of the center are well in accordance with the DxO scores but not the corners

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Offline cokwalon

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Re: Comparison with dpreview
« Reply #3 on: June 13, 2013, 02:32:20 am »
Can you explain ? the images of the center are well in accordance with the DxO scores but not the corners

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The focus distance was closer in the case of the Nikon, which will render the corners soft at max aperture.

Offline fourthird

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Re: Comparison with dpreview
« Reply #4 on: June 13, 2013, 06:09:48 am »
How do you know that there is a difference in focus distance ? It is very strange since the two lenses have almost the same length (18.5 for the Nikon vs 18.3 for Ricoh). The Ricoh has 2 aspheric elements, which is not the case for the Nikon (0 aspherical elements), and since the distance between the sensor and the lens is very small, this is maybe the explanation.

DxO team write "In the extreme corners the Ricoh is brighter, approximately 1 EV at full aperture dropping to +2/3EV from f/4 through to f/16. In today’s digital world, however, vignetting isn’t as much as a problem as it was in the days of film."

Vignetting is not a problem because softwares can correct that ...

I am still curious about the way DxO lens score integrates the homogeneity of resolution across the whole frame.

Anyway, 2 top cameras, both permitting fantastic image capture. Nikon was commercialized before the Ricoh, and the Ricoh is less expensive (250 €) ...

Best regards