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  Test # 384 
 
Lens Distortion Test

Sigma 10-20mm.F/4-5.6 Distortion Test

Distortion at 20mm.
 
Test by Sinan Ozturk   
PhotoAgainst Photo Editor's Comment: Barrel Distortion is optical flaw of a lens which causes straight lines in the photo look slightly curved outwards. Its much more apparent in wider focal lengths and zoom lenses and gets worse in the bottom or top of the photo, rather than center. It becomes apparent when skyline is photographed so we do barrel distortion tests with a clear skyline shot.

In the first comparison, skyline in the very bottom of the photo because this is where barrel distortion is worse for any lens.

In the second shot skyline is in the very center of the image where barrel distortion's effect is the least apparent.

In the third shot, skyline is in the 1/3 or 2/3 of the photo (golden rule) where distortion is same for both.

Red line in the photos are added in post production to show where skyline would suppose to be if lens were flawless with no distortion. The closer the real skyline to the red line, the better the lens and more apart the skyline from the red line, worse distortion the lens has.

For more information about this distortion tests, please read our distortion test guidelines.

After reviewing the test, scroll to the bottom of the page to compare Sigma 10-20mm.F/4-5.6's Barrel Distortion with other lenses.
  
  
  Test Photo # 1  
Photo_624Sigma 10-20mm. F/4-5.6  
F:11.0, S:1/200, ISO:100    
Photo by Sinan Ozturk 
    EXIF    
Sony A35     Camera    
Sigma 10-20mm. F/4-5.6     Lens    
11.0     Aperture    
1/200     Shutter    
100     ISO    
168     Brightness    
20 mm.     Focal Length    
30 mm.     Foc.Len.FF eq    
20 mm.     Foc.Len.APS-C    
0.76 Mb.   Filesize    
1628 x 1080 [1 MP.]   Dimensions    
 
  Test Photo # 2  
Photo_625Sigma 10-20mm. F/4-5.6  
F:11.0, S:1/160, ISO:100    
Photo by Sinan Ozturk 
    EXIF    
Sony A35     Camera    
Sigma 10-20mm. F/4-5.6     Lens    
11.0     Aperture    
1/160     Shutter    
100     ISO    
174     Brightness    
20 mm.     Focal Length    
30 mm.     Foc.Len.FF eq    
20 mm.     Foc.Len.APS-C    
0.90 Mb.   Filesize    
1629 x 1080 [1 MP.]   Dimensions    
 
  Test Photo # 3  
Photo_626Sigma 10-20mm. F/4-5.6  
F:11.0, S:1/125, ISO:100    
Photo by Sinan Ozturk 
    EXIF    
Sony A35     Camera    
Sigma 10-20mm. F/4-5.6     Lens    
11.0     Aperture    
1/125     Shutter    
100     ISO    
168     Brightness    
20 mm.     Focal Length    
30 mm.     Foc.Len.FF eq    
20 mm.     Foc.Len.APS-C    
1.06 Mb.   Filesize    
1628 x 1080 [1 MP.]   Dimensions    
 
Barrel Distortion Comparison
You can select 2 lens to compare their barrel distortions side by side:
against

 

 

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  Other Sigma 10-20mm. F/4-5.6 vs. Comparisons  
Sigma 10-20 F4-5.6 Sharpness Test at 20mm.
at 20mm.
Tested Apertures Between F5.6 to F13.0
Sigma 10-20 F4-5.6 Sharpness Test at 10mm.
at 10mm.
Tested Apertures Between F4.0 to F13.0
Sigma 10-20mm.F/4-5.6 Distortion Test
Distortion at 11mm.
Sigma 10-20 F4-5.6
Sharpness at 10mm.
Tested Apertures F4/F11, F5.6/F11, F8/F11, F11/F16
Sigma 10-20 F4-5.6
Sharpness at 20mm.
Tested Apertures F5.6/F8, F8/F11, F8/F16
  Other Comparisons of Sigma 10-20mm. F/4-5.6  
Sigma 10-20 F4-5.6 vs. Vivitar 13mm 2.8
Sharpness at 13mm.
Tested Apertures F2.8/F4.5, F4/F4.5, F5.6, F8, F11, F16, F22
Sigma 12-24 vs. Sigma 10-20 F4-5.6
Sharpness at 13mm.
Tested Apertures F4.5, F5.6, F8, F11, F16, F22
Sigma 10-20 F4-5.6 vs. Sigma 12-24
Sharpness at 12mm.
Tested Apertures F4.5, F8, F16
Sigma 10-20 F4-5.6 vs. Vivitar 13mm 2.8
Sharpness at 13mm.
Tested Apertures F2.8/F5, F4/F5, F5.6, F8, F11, F16, F16/F22
Sigma 12-24 vs. Sigma 10-20 F4-5.6
Sharpness at 13mm.
Tested Apertures F5, F5.6, F8, F11, F16, F16/F22
Sigma 10-20 F4-5.6 vs. Samsung 18-55
Sharpness at 18mm.
Tested Apertures F3.5/F5.6, F4/F5.6, F4.5/F5.6, F5/F5.6, F5.6, F6.3, F8, F10
Sigma 10-20 F4-5.6 vs. Sony E.16-50
Sharpness at 18mm.
Tested Apertures F3.5/F5.6, F4/F5.6, F4.5/F5.6, F5/F5.6, F5.6, F6.3, F8, F10
Sony 18-200 vs. Sigma 10-20 F4-5.6
Sharpness at 18mm.
Tested Apertures F3.5/F5.6, F4/F5.6, F4.5/F5.6, F5/F5.6, F5.6, F6.3, F8, F10
Tamron 18-200 vs. Sigma 10-20 F4-5.6
Sharpness at 18mm.
Tested Apertures F3.5/F5.6, F4/F5.6, F4.5/F5.6, F5/F5.6, F5.6, F6.3, F8, F10
Tamron 17-50 vs. Sigma 10-20 F4-5.6
Sharpness at 18mm.
Tested Apertures F2.8/F5.6, F3.2/F5.6, F3.5/F5.6, F4/F5.6, F4.5/F5.6, F5/F5.6, F5.6, F6.3, F8, F10
Sony 16-105 vs. Sigma 10-20 F4-5.6
Sharpness at 18mm.
Tested Apertures F4/F5.6, F4.5/F5.6, F5/F5.6, F5.6, F6.3, F8, F10
Sony 16-50 vs. Sigma 10-20 F4-5.6
Sharpness at 18mm.
Tested Apertures F2.8/F5.6, F3.2/F5.6, F3.5/F5.6, F4/F5.6, F4.5/F5.6, F5/F5.6, F5.6, F6.3, F8, F10
Sony 18-55 vs. Sigma 10-20 F4-5.6
Sharpness at 18mm.
Tested Apertures F3.5/F5.6, F4/F5.6, F4.5/F5.6, F5/F5.6, F5.6, F6.3, F8, F10
Sigma 10-20 F4-5.6 vs. Sony E.16-50
Sharpness at 16mm.
Tested Apertures F3.5/F5, F4/F5, F4.5/F5, F5, F5.6, F6.3, F8
Sigma 10-20 F4-5.6 vs. Sony 16-50
Sharpness at 16mm.
Tested Apertures F2.8/F5, F3.2/F5, F3.5/F5, F4/F5, F4.5/F5, F5, F5.6, F6.3, F8
Sigma 10-20 F4-5.6 vs. Sony 16-105
Sharpness at 16mm.
Tested Apertures F3.5/F5, F4/F5, F4.5/F5, F5, F5.6, F6.3, F8
Sigma 10-20 vs. Sigma 12-24
at 10-12mm.
Wide Angle Video Shot
Sigma 10-20 F4-5.6 vs. Sigma 12-24
Sharpness at 17mm.
Tested Apertures F5/F5.6, F5.6, F6.3
Sony 18-55 vs. Sigma 10-20 F4-5.6
Sharpness at 17-18mm.
Tested Apertures F3.5/F5, F4.5/F5, F5.6, F6.3