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  Test # 386 
 
Lens Distortion Test

Sigma 17-70 Distortion Test

Distortion at 50mm.
 
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 17-70's Barrel Distortion with other lenses.
  
  
  Test Photo # 1  
Photo_602Sigma 17-70 F/2.8-4 DS Macro HSM  
F:11.0, S:1/250, ISO:100    
Photo by Sinan Ozturk 
    EXIF    
Sony A35     Camera    
Sigma 17-70 F/2.8-4 DS Macro HSM     Lens    
11.0     Aperture    
1/250     Shutter    
100     ISO    
172     Brightness    
50 mm.     Focal Length    
75 mm.     Foc.Len.FF eq    
50 mm.     Foc.Len.APS-C    
0.76 Mb.   Filesize    
1627 x 1080 [1 MP.]   Dimensions    
 
  Test Photo # 2  
Photo_601Sigma 17-70 F/2.8-4 DS Macro HSM  
F:11.0, S:1/200, ISO:100    
Photo by Sinan Ozturk 
    EXIF    
Sony A35     Camera    
Sigma 17-70 F/2.8-4 DS Macro HSM     Lens    
11.0     Aperture    
1/200     Shutter    
100     ISO    
170     Brightness    
50 mm.     Focal Length    
75 mm.     Foc.Len.FF eq    
50 mm.     Foc.Len.APS-C    
0.93 Mb.   Filesize    
1627 x 1080 [1 MP.]   Dimensions    
 
  Test Photo # 3  
Photo_600Sigma 17-70 F/2.8-4 DS Macro HSM  
F:11.0, S:1/160, ISO:100    
Photo by Sinan Ozturk 
    EXIF    
Sony A35     Camera    
Sigma 17-70 F/2.8-4 DS Macro HSM     Lens    
11.0     Aperture    
1/160     Shutter    
100     ISO    
168     Brightness    
50 mm.     Focal Length    
75 mm.     Foc.Len.FF eq    
50 mm.     Foc.Len.APS-C    
1.05 Mb.   Filesize    
1629 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 17-70 F/2.8-4 DS Macro HSM vs. Comparisons  
Sigma 17-70 Sharpness Test at 70mm.
at 70mm.
Tested Apertures Between F4.0 to F13.0
Sigma 17-70 Sharpness Test at 17mm.
at 17mm.
Tested Apertures Between F2.8 to F13.0
Sigma 17-70 F/2.8 - F4 Video Auto Focus Performance
at 17-70mm.
Auto Focus Noise (Sound), AF Speed and Focus Hunting Test (in Silent Enviroment)
Sigma 17-70 Distortion Test
Distortion at 17mm.
Sigma 17-70 F.2.8-4
Sharpness at 50mm.
Tested Apertures F4/F8
Sigma 17-70
Sharpness at 70mm.
Tested Apertures F4/F8, F4/F5.6, F5.6/F8
  Other Comparisons of Sigma 17-70 F/2.8-4 DS Macro HSM  
Sigma 17-70 vs. Sony 16-105
Sharpness at 70mm.
Tested Apertures F4/F5.6, F4.5/F5.6, F5/F5.6, F5.6, F6.3, F7.1, F8
Sigma 17-70 vs. Minolta 28-105
Sharpness at 70mm.
Tested Apertures F4/F4.5, F4.5, F5, F5.6, F6.3, F7.1, F8
Sigma 17-70 vs. Minolta 35-105mm.
Sharpness at 70mm.
Tested Apertures F4/F4.5, F4.5, F5, F5.6, F6.3, F7.1, F8
Sigma 17-70 vs. Tamron 18-200
Sharpness at 70mm.
Tested Apertures F4/F5.6, F4.5/F5.6, F5/F5.6, F5.6, F6.3, F7.1, F8
Minolta 28-70 2.8 vs. Sigma 17-70
Sharpness at 70mm.
Tested Apertures F2.8/F4, F3.5/F4, F4, F4.5, F5, F5.6, F6.3, F7.1, F8
Tokina 28-70 2.8 vs. Sigma 17-70
Sharpness at 70mm.
Tested Apertures F2.8/F4, F3.5/F4, F4, F4.5, F5, F5.6, F6.3, F7.1, F8
Sigma 17-70 vs. Sony 16-50
Sharpness at 28mm.
Tested Apertures F2.8/F3.2, F3.5, F4, F4.5, F5, F5.6, F6.3, F7.1
Sigma 17-70 vs. Tamron 18-200
Sharpness at 28mm.
Tested Apertures F3.2/F4, F3.5/F4, F4, F4.5, F5, F5.6, F6.3, F7.1
Sigma 17-70 vs. Tokina 28-70 2.8
Sharpness at 28mm.
Tested Apertures F2.8/F3.2, F3.5, F4, F4.5, F5, F5.6, F6.3, F7.1
Sigma 17-70 vs. Minolta 28-70 2.8
Sharpness at 28mm.
Tested Apertures F2.8/F3.2, F3.5, F4, F4.5, F5, F5.6, F6.3, F7.1
Sigma 17-70 vs. Sony 16-105
Sharpness at 28mm.
Tested Apertures F3.2/F4.5, F3.5/F4.5, F4/F4.5, F4.5, F5, F5.6, F6.3, F7.1
Sony 18-55 vs. Sigma 17-70
Sharpness at 28mm.
Tested Apertures F3.2/F4.5, F3.5/F4.5, F4/F4.5, F4.5, F5, F5.6, F6.3, F7.1
Cosina 19-35 vs. Sigma 17-70
Sharpness at 28mm.
Tested Apertures F3.2/F4, F3.5/F4, F4, F4.5, F5, F5.6, F6.3, F7.1
Tamron 17-50 vs. Sigma 17-70
Sharpness at 28mm.
Tested Apertures F2.8/F3.2, F3.5, F4, F4.5, F5, F5.6, F6.3, F7.1
Minolta 28-105 vs. Sigma 17-70
Sharpness at 28mm.
Tested Apertures F3.2/F3.5, F3.5, F4, F4.5, F5, F5.6, F6.3, F7.1
Sigma 17-70 vs. Minolta 35-105mm.
Sharpness at 35mm.
Tested Apertures F3.5/F4, F4, F4.5, F5, F5.6, F6.3, F7.1, F8
Sigma 17-70 vs. Minolta 28-105
Sharpness at 35mm.
Tested Apertures F3.5/F4, F4, F4.5, F5, F5.6, F6.3, F7.1, F8
Sigma 17-70 vs. Sony 35mm 1.8
Sharpness at 35mm.
Tested Apertures F1.8/F3.5, F2.8/F3.5, F3.5, F4, F4.5, F5, F5.6, F6.3, F7.1, F8
Sigma 17-70 vs. Tamron 17-50
Sharpness at 35mm.
Tested Apertures F2.8/F3.5, F3.5, F4, F4.5, F5, F5.6, F6.3, F7.1, F8