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05-10-2012, 01:13 PM   #1
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DXO Mark lens scores?????

While browsing through the DXO lens scores all the pentax lens seem to score pretty low. Even the limited ones. Are the pentax lens that bad?

05-10-2012, 01:15 PM   #2
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No.
05-10-2012, 01:26 PM   #3
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QuoteOriginally posted by robert Quote
While browsing through the DXO lens scores all the pentax lens seem to score pretty low. Even the limited ones. Are the pentax lens that bad?

DXO is a bit unfair towards Pentax lenses. But also - you have to view all other lenses a the same sensor format. For example, looking at Nikon lenses, choose the D7000 as the camera to see the score. Once you do, the scores normalize a lot more. A Nikon lens scoring 30 may score around 17 on the D7000, making it a lot more equal to the Pentax scores.
05-10-2012, 01:37 PM   #4
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Possibly, but it doesn't seem to stop Pentax users making incredibly detailed photos at wide apertures and extreme focal lengths...

05-10-2012, 01:44 PM   #5
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I find photozone.de more useful for the more technical reviews of Pentax lenses. DXO is useful for sensors.
05-10-2012, 01:52 PM   #6
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Lenstip is good too, but I still wouldn't encourage too much reading into lens tests.
05-10-2012, 01:57 PM   #7
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The issue with DXO mark scores on lenses is that it is difficult to tell what they mean. All of the Pentax lenses seem to score the same, with the DA 35 f2.4 scoring the best. I guess it scores best because of best light transmission, but otherwise it is hard to say how they are comparing these lenses (or those of Canon/Nikon either). How do you really compare a 40mm prime lens to a 70-200 zoom, even if they are shot on the same sensor? Still, with a numerical score, I guess anything is possible.

Last edited by Rondec; 05-10-2012 at 02:33 PM.
05-10-2012, 02:23 PM   #8
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Absolutely no bloody idea as to exactly what it is that the DXO score measures. A score without context. Utterly worthless IMO. At least photozone.de and lenstip give some indication of what it is they're measuring.

05-10-2012, 02:24 PM   #9
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DXO says what they measure. Now as for what weight each measurement gets... that's a unknown. It appears, from looking at different lenses, that the measured T-stop is heavily favored. That is the light transmission of the lens - it seems odd that it is given such a heavy weight compared to say, resolution and abberrations.
05-10-2012, 02:53 PM   #10
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They do give an interesting explanation on what the scores mean: DxOMark - DxOMark Score

QuoteQuote:
The idea of DxOMark Score is to quantify the amount of information captured by the camera, taking into account all the optical aberrations and sensor characteristics measured by DxO Labs.
I like all the colorful graphs that are displayed on each lens' page and wish they would test more pentax lenses, but of course most of them have to be taken with a grain of salt. It's only numbers.
05-12-2012, 05:33 AM   #11
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Lens tests are a matter of trust. I don't trust DXO. To be fair, each test is only valid for a lens/camera combination, so you can not compare Pentax to other mounts directly. They are not testing lenses, but lenses mounted to specfic cameras. Higherpixel density typically results in better resolution figures, but that is not everything. DXO appear to be scientific providing numbers for everything - they don't really know what they are doing and results have not much to do with a photographic test. Photozone adds comments that are quite good to judge overall quality.
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