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  Comparison # 2898 
  
Lens Sharpness Comparison

Sony 28-70(E) vs. Sigma 28-70 F/2.8-4
Sharpness at 70mm.
Tested Apertures F4/F5.6, F5.6, F8, F16
 
Comparison by Sinan Ozturk   
PhotoAgainst Photo Editor's Comment: Sigma 28-70 mm f/2.8-4 is actually an "A mount" lens. For this comparison, its plugged into a Sony A7R camera with Sony LA-EA4 adaptor.
  
  
  Comparison Photo # 1  
Photo_5954Sony 28-70mm. F3.5-5.6 OSS  
against
Photo_5950 Sigma 28-70 mm f/2.8-4
F5.6 1/2 100 70mm.    
  F4.0 1/3100 70mm.  
Photo by Sinan Ozturk  Photo by Sinan Ozturk 
100% (1:1) Crop Samples
Sony 28-70mm. F3.5-5.6 OSS
Center
F/5.6
Brightness 50
(Almost Same)
Sony 28-70mm. F3.5-5.6 OSS
Corner (Bottom Right)
F/5.6
Brightness 52
(Almost Same)
Sony 28-70mm. F3.5-5.6 OSS
Between Center and Top Right Corner
F/5.6
Brightness 37
(Almost Same)
Sony 28-70mm. F3.5-5.6 OSS
Around Center
F/5.6
Brightness 71
(Exactly Same)
Sigma 28-70 mm f/2.8-4
Center
F/4.0
Brightness 55
(Almost Same)
Sigma 28-70 mm f/2.8-4
Corner (Bottom Right)
F/4.0
Brightness 56
(Almost Same)
Sigma 28-70 mm f/2.8-4
Between Center and Top Right Corner
F/4.0
Brightness 40
(Almost Same)
Sigma 28-70 mm f/2.8-4
Around Center
F/4.0
Brightness 71
(Exactly Same)
Display crops in Black & White
  EXIF  
 
  Comparison Photo # 2  
Photo_5954Sony 28-70mm. F3.5-5.6 OSS  
against
Photo_5951 Sigma 28-70 mm f/2.8-4
F5.6 1/2 100 70mm.    
  F5.6 10/16100 70mm.  
100% (1:1) Crop Samples
Sony 28-70mm. F3.5-5.6 OSS
Center
F/5.6
Brightness 50
5% Darker
Sony 28-70mm. F3.5-5.6 OSS
Corner (Bottom Right)
F/5.6
Brightness 52
7% Darker
Sony 28-70mm. F3.5-5.6 OSS
Between Center and Top Right Corner
F/5.6
Brightness 37
5% Darker
Sony 28-70mm. F3.5-5.6 OSS
Around Center
F/5.6
Brightness 71
5% Darker
Sigma 28-70 mm f/2.8-4
Center
F/5.6
Brightness 63
5% Brighter
Sigma 28-70 mm f/2.8-4
Corner (Bottom Right)
F/5.6
Brightness 69
7% Brighter
Sigma 28-70 mm f/2.8-4
Between Center and Top Right Corner
F/5.6
Brightness 50
5% Brighter
Sigma 28-70 mm f/2.8-4
Around Center
F/5.6
Brightness 85
5% Brighter
Display crops in Black & White
  EXIF  
 
  Comparison Photo # 3  
Photo_5944Sony 28-70mm. F3.5-5.6 OSS  
against
Photo_5952 Sigma 28-70 mm f/2.8-4
F8.0 4/5 100 70mm.    
  F8.0 13/10100 70mm.  
100% (1:1) Crop Samples
Sony 28-70mm. F3.5-5.6 OSS
Center
F/8.0
Brightness 52
5% Darker
Sony 28-70mm. F3.5-5.6 OSS
Corner (Bottom Right)
F/8.0
Brightness 57
9% Darker
Sony 28-70mm. F3.5-5.6 OSS
Between Center and Top Right Corner
F/8.0
Brightness 40
5% Darker
Sony 28-70mm. F3.5-5.6 OSS
Around Center
F/8.0
Brightness 71
6% Darker
Sigma 28-70 mm f/2.8-4
Center
F/8.0
Brightness 63
5% Brighter
Sigma 28-70 mm f/2.8-4
Corner (Bottom Right)
F/8.0
Brightness 79
9% Brighter
Sigma 28-70 mm f/2.8-4
Between Center and Top Right Corner
F/8.0
Brightness 53
5% Brighter
Sigma 28-70 mm f/2.8-4
Around Center
F/8.0
Brightness 86
6% Brighter
Display crops in Black & White
  EXIF  
 
  Comparison Photo # 4  
Photo_5945Sony 28-70mm. F3.5-5.6 OSS  
against
Photo_5953 Sigma 28-70 mm f/2.8-4
F16.0 16/5 100 70mm.    
  F16.0 5/1100 70mm.  
100% (1:1) Crop Samples
Login or Register to display 4 crops from Sony 28-70mm. F3.5-5.6 OSS F/16.0 vs. Sigma 28-70 mm f/2.8-4 F/16.0 for locations Center, Corner (Bottom Right), Between Center and Top Right Corner, Around Center
  EXIF  
 
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  Other Comparisons of Sony 28-70mm. F3.5-5.6 OSS  
Sony 28-70(E) vs. Sony 24-240(E)
Sharpness at 70mm.
Tested Apertures F5/F5.6, F5.6, F8, F16
Sony 28-70(E)
at 70mm.
Tested Apertures Between F5.6 to F13.0
Sony 28-70(E)
at 28mm.
Tested Apertures Between F3.5 to F13.0
  Other Comparisons of Sigma 28-70 mm f/2.8-4  
Sigma 28-70 F/2.8-4 vs. Sony 24-240(E)
Sharpness at 70mm.
Tested Apertures F4/F5, F5.6, F8, F16
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