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  Test # 68 
 
Lens Sharpness Test

Sigma 17-70 F.2.8-4

Sharpness at 50mm.
Tested Apertures F4/F8
 
Test by Sinan Ozturk   
F4 is the largest aperture of Sigma 17-70 at 60mm. At this aperture sharpness is not very great and it has a serious vignetting problem.

When stopped down to F8 both dramatically improves.
            [Review by Sinan Ozturk]
  
  
  Comparison Photo # 1  
Photo_186Sigma 17-70 F/2.8-4 DS Macro HSM  
against
Photo_185 Sigma 17-70 F/2.8-4 DS Macro HSM
F4.0 1/1000 100 60mm.    
  F8.0 1/320100 60mm.  
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 122
(Almost Same)
Sigma 17-70 F/2.8-4 DS Macro HSM
Center
F/4.0
Brightness 181
5% Darker
Sigma 17-70 F/2.8-4 DS Macro HSM
Border (Left)
F/4.0
Brightness 137
9% Darker
Sigma 17-70 F/2.8-4 DS Macro HSM
Center 2
F/4.0
Brightness 211
(Almost Same)
Sigma 17-70 F/2.8-4 DS Macro HSM
Focus Point
F/8.0
Brightness 126
(Almost Same)
Sigma 17-70 F/2.8-4 DS Macro HSM
Center
F/8.0
Brightness 193
5% Brighter
Sigma 17-70 F/2.8-4 DS Macro HSM
Border (Left)
F/8.0
Brightness 160
9% Brighter
Sigma 17-70 F/2.8-4 DS Macro HSM
Center 2
F/8.0
Brightness 214
(Almost Same)
Display crops in Black & White
  EXIF  
 

 

 

  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
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