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  Test # 16 
 
Lens Sharpness Test

Sigma 17-70

Sharpness at 70mm.
Tested Apertures F4/F8, F4/F5.6, F5.6/F8
 
Test by Sinan Ozturk   
Shots taken with tripod + remote control. First comparison is Sigma 17-70's widest aperture of at 70mm which is F4. So F4 is compared to F8 which is suppose to be the peak performance aperture. In the second comparison, F4 is compared to 1 stop above F5.6 and third comparison is F5.6 against F8             [Review by Sinan Ozturk]
  
  
  Comparison Photo # 1  
Photo_61Sigma 17-70 F/2.8-4 DS Macro HSM  
against
Photo_62 Sigma 17-70 F/2.8-4 DS Macro HSM
F4.0 1/640 100 70mm.    
  F8.0 1/160100 70mm.  
Photo by Sinan Ozturk  Photo by Sinan Ozturk 
100% (1:1) Crop Samples
Sigma 17-70 F/2.8-4 DS Macro HSM
Focus Point
F/4.0
Brightness 109
(Almost Same)
Sigma 17-70 F/2.8-4 DS Macro HSM
Focus Point
F/8.0
Brightness 113
(Almost Same)
Display crops in Black & White
  EXIF  
 
  Comparison Photo # 2  
Photo_61Sigma 17-70 F/2.8-4 DS Macro HSM  
against
Photo_59 Sigma 17-70 F/2.8-4 DS Macro HSM
F4.0 1/640 100 70mm.    
  F5.6 1/320100 70mm.  
100% (1:1) Crop Samples
Sigma 17-70 F/2.8-4 DS Macro HSM
Focus Point
F/4.0
Brightness 109
(Almost Same)
Sigma 17-70 F/2.8-4 DS Macro HSM
Focus Point
F/5.6
Brightness 120
(Almost Same)
Display crops in Black & White
  EXIF  
 
  Comparison Photo # 3  
Photo_59Sigma 17-70 F/2.8-4 DS Macro HSM  
against
Photo_62 Sigma 17-70 F/2.8-4 DS Macro HSM
F5.6 1/320 100 70mm.    
  F8.0 1/160100 70mm.  
100% (1:1) Crop Samples
Sigma 17-70 F/2.8-4 DS Macro HSM
Focus Point
F/5.6
Brightness 120
(Almost Same)
Sigma 17-70 F/2.8-4 DS Macro HSM
Focus Point
F/8.0
Brightness 113
(Almost Same)
Display crops in Black & White
  EXIF  
 
Custom Comparison
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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 50mm.
Sigma 17-70 Distortion Test
Distortion at 17mm.
Sigma 17-70 F.2.8-4
Sharpness at 50mm.
Tested Apertures F4/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