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  Test # 372 
 
Lens Distortion Test

Sigma 12-24 Distortion Test

Distortion at 12mm.
 
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 12-24's Barrel Distortion with other lenses.
  
  
  Test Photo # 1  
Photo_826Sigma 12-24 F4.5-5.6 DG  
F:8.0, S:1/500, ISO:100    
Photo by Sinan Ozturk 
    EXIF    
Sony A99     Camera    
Sigma 12-24 F4.5-5.6 DG     Lens    
8.0     Aperture    
1/500     Shutter    
100     ISO    
101     Brightness    
0     Contrast    
0     Saturation    
0     Sharpness    
12 mm.     Focal Length    
12 mm.     Foc.Len.FF eq    
8 mm.     Foc.Len.APS-C    
Standard     Scene Mode    
Auto     White Balance    
0.22 Mb.   Filesize    
1657 x 1080 [1 MP.]   Dimensions    
 
  Test Photo # 2  
Photo_824Sigma 12-24 F4.5-5.6 DG  
F:8.0, S:1/640, ISO:100    
Photo by Sinan Ozturk 
    EXIF    
Sony A99     Camera    
Sigma 12-24 F4.5-5.6 DG     Lens    
8.0     Aperture    
1/640     Shutter    
100     ISO    
102     Brightness    
0     Contrast    
0     Saturation    
0     Sharpness    
12 mm.     Focal Length    
12 mm.     Foc.Len.FF eq    
8 mm.     Foc.Len.APS-C    
Standard     Scene Mode    
Auto     White Balance    
0.44 Mb.   Filesize    
1648 x 1080 [1 MP.]   Dimensions    
 
  Test Photo # 3  
Photo_825Sigma 12-24 F4.5-5.6 DG  
F:8.0, S:1/500, ISO:100    
Photo by Sinan Ozturk 
    EXIF    
Sony A99     Camera    
Sigma 12-24 F4.5-5.6 DG     Lens    
8.0     Aperture    
1/500     Shutter    
100     ISO    
106     Brightness    
0     Contrast    
0     Saturation    
0     Sharpness    
12 mm.     Focal Length    
12 mm.     Foc.Len.FF eq    
8 mm.     Foc.Len.APS-C    
Standard     Scene Mode    
Auto     White Balance    
0.57 Mb.   Filesize    
1656 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 12-24 F4.5-5.6 DG vs. Comparisons  
Sigma 12-24 Sharpness Test at 24mm.
at 24mm.
Tested Apertures Between F5.6 to F13.0
Sigma 12-24 Sharpness Test at 12mm.
at 12mm.
Tested Apertures Between F4.5 to F13.0
Sigma 12-24 F4.5-5.6 DG Video Auto Focus Performance
at 12-24mm.
Auto Focus Noise (Sound), AF Speed and Focus Hunting Test (in Silent Enviroment)
Sigma 12-24 Distortion Test
Distortion at 24mm.
Sigma 12-24 Video AF Performance
at 12-24mm.
Auto Focus Speed and Noise
  Other Comparisons of Sigma 12-24 F4.5-5.6 DG  
Sigma 12-24 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 12-24 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. 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. Vivitar 13mm 2.8
Sharpness at 13mm.
Tested Apertures F2.8/F5, F4/F5, F5.6, F8, F11, 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 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 12-24
Sharpness at 17-18mm.
Tested Apertures F3.5/F5.6, F4.5/F5.6, F5.6, F6.3
Tamron 18-200 vs. Sigma 12-24
Sharpness at 17-18mm.
Tested Apertures F3.5/F5.6, F4.5/F5.6, F5.6, F6.3
Sony 16-50 vs. Sigma 12-24
Sharpness at 17mm.
Tested Apertures F2.8/F5.6, F4.5/F5.6, F5.6, F6.3
Sony 16-105 vs. Sigma 12-24
Sharpness at 16-17mm.
Tested Apertures F3.5/F5.6, F4.5/F5.6, F5.6, F6.3
Tamron 17-50 vs. Sigma 12-24
Sharpness at 17-18mm.
Tested Apertures F2.8/F5.6, F4.5/F5.6, F5.6, F6.3
Carl Zeiss 24-70 vs. Sigma 12-24
Sharpness at 24mm.
Tested Apertures F2.8/F5.6, F5.6, F8, F16, F13/F16
Carl Zeiss 24-70 vs. Sigma 12-24
Sharpness at 24mm.
Tested Apertures F2.8/F5.6, F5.6, F8, F16, F16