Sigma 8-16 - DxOMark [or Sigma] quality fail?

lytrytyr · 12-16-2014, 04:55 AM

Originally posted by rawr

I just noticed that the K-3 test result at 8mm and f4.5 is identical to the flag of Bangladesh

At least the decentering of the Bangladeshi flag was deliberate!

Edgar_in_Indy · 12-16-2014, 06:18 AM - **2 Likes**

Here's a recent picture from my own Sigma 8-16mm, and I just don't see what DxoMark is talking about. Sure, you might lose a little bit of resolution in the "doughnut" area, but I think it's an acceptable trade-off for such an extreme angle of view:

**maxfield_photo** · 12-16-2014, 11:16 AM

[deleted by author]

My point is that DxO boils an entire lens review down to one number so that it's "easy" for internet consumers to understand, and that number is based entirely on two dimensional test charts. In the real world though, we shoot three dimensional scenes. DxO does not publish their test methods, or even sample images. Anyone who has spent any time shooting with a great lens knows there there is more to the equation than sharpness. Color rendition, bokeh, in-focus to out-of-focus transition, control of coma, focusing speed, focusing accuracy, build quality, handling... the list goes on. All these things should be taken into account when rating a lens. So I call DxO's reviews irresponsible. For instance, if they did their research they would know that the K-mount does not report focal lengths below 10mm, (yet there is a way to add that EXIF data later which they did not do.)

Anyone considering the Sigma 8-16 should look at some real world images from the lens and decide for themselves. It's a really fun and unique lens. 8mm is SO much wider than 10mm or 12mm, it's hard to comprehend the difference 2mm makes until you experience it.

powasky · 12-28-2014, 10:01 AM - **1 Like**

Ya know, I never realized that I was shooting with that Sigma 8-16 too! Check it out...

Edgar_in_Indy · 12-28-2014, 10:04 AM

Originally posted by powasky

Ya know, I never realized that I was shooting with that Sigma 8-16 too! Check it out...

Lol, yeah...just keep the important parts in the "doughnut hole', and you'll do fine!

12-16-2014, 06:18 AM - 2 Likes	#17
Edgar_in_Indy Veteran Member Join Date: May 2010 Location: Indiana, USA Photos: Gallery Posts: 2,685	Here's a recent picture from my own Sigma 8-16mm, and I just don't see what DxoMark is talking about. Sure, you might lose a little bit of resolution in the "doughnut" area, but I think it's an acceptable trade-off for such an extreme angle of view: Last edited by Edgar_in_Indy; 01-29-2015 at 09:20 AM.

12-16-2014, 11:16 AM	#18
maxfield_photo Site Supporter Join Date: Mar 2011 Location: Cincinnati, OH Posts: 1,216	[deleted by author] My point is that DxO boils an entire lens review down to one number so that it's "easy" for internet consumers to understand, and that number is based entirely on two dimensional test charts. In the real world though, we shoot three dimensional scenes. DxO does not publish their test methods, or even sample images. Anyone who has spent any time shooting with a great lens knows there there is more to the equation than sharpness. Color rendition, bokeh, in-focus to out-of-focus transition, control of coma, focusing speed, focusing accuracy, build quality, handling... the list goes on. All these things should be taken into account when rating a lens. So I call DxO's reviews irresponsible. For instance, if they did their research they would know that the K-mount does not report focal lengths below 10mm, (yet there is a way to add that EXIF data later which they did not do.) Anyone considering the Sigma 8-16 should look at some real world images from the lens and decide for themselves. It's a really fun and unique lens. 8mm is SO much wider than 10mm or 12mm, it's hard to comprehend the difference 2mm makes until you experience it. Last edited by maxfield_photo; 12-16-2014 at 01:39 PM.

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12-16-2014, 04:55 AM	#16
lytrytyr Pentaxian Join Date: Nov 2011 Photos: Gallery \| Albums Posts: 4,310	Originally posted by rawr I just noticed that the K-3 test result at 8mm and f4.5 is identical to the flag of Bangladesh At least the decentering of the Bangladeshi flag was deliberate!

12-28-2014, 10:01 AM - 1 Like	#19
powasky Senior Member Join Date: Dec 2014 Posts: 105	Ya know, I never realized that I was shooting with that Sigma 8-16 too! Check it out...

12-28-2014, 10:04 AM	#20
Edgar_in_Indy Veteran Member Join Date: May 2010 Location: Indiana, USA Photos: Gallery Posts: 2,685	Originally posted by powasky Ya know, I never realized that I was shooting with that Sigma 8-16 too! Check it out... Lol, yeah...just keep the important parts in the "doughnut hole', and you'll do fine!