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  Comparison # 70 
 
Lens Sharpness Comparison

Sigma 17-70 vs. Sigma 50mm 2.8

Sharpness at 50mm.
Tested Apertures F4, F8
 
Comparison by Sinan Ozturk   
At 50mm Sigma 17-70's widest aperture is F4 so in the first comparison both lenses were compared at F4. At this aperture their center sharpness performance is very close but Sigma 50mm is still one step ahead. Unfortunately the photos are not giving a very good idea for corner sharpness and I apologize for that but if you zoom to right bottom corner, I guess you'll also agree with me that Signa 50mm is also better in corners at this aperture. At F4 Sigma 17-70 also have a vignetting problem and this is why its photo is much darker than Sigma 50mm.

When both lenses were stopped down to F8, Sigma 17-70's vignetting problem is mostly cured (yet Sigma 50mm still have a brighter photo). And Sigma 50mm is still has better sharpness both in centers and corners. Sigma 17-70's center performance comes close (but not on par) but it is still not close in corner performance.
            [Review by Sinan Ozturk]
  
  
  Comparison Photo # 1  
Photo_193Sigma 50mm F/2.8 DG Macro  
against
Photo_195 Sigma 17-70 F/2.8-4 DS Macro HSM
F4.0 1/1000 100 50mm.    
  F4.0 1/800100 50mm.  
Photo by Sinan Ozturk  Photo by Sinan Ozturk 
100% (1:1) Crop Samples
Sigma 50mm F/2.8 DG Macro
Focus Point
F/4.0
Brightness 160
(Almost Same)
Sigma 17-70 F/2.8-4 DS Macro HSM
Focus Point
F/4.0
Brightness 157
(Almost Same)
Black & White crops are displayed for better details study.
Click here to switch back to colored crops.
  EXIF  
 
  Comparison Photo # 2  
Photo_194Sigma 50mm F/2.8 DG Macro  
against
Photo_196 Sigma 17-70 F/2.8-4 DS Macro HSM
F8.0 1/250 100 50mm.    
  F8.0 1/200100 50mm.  
100% (1:1) Crop Samples
Sigma 50mm F/2.8 DG Macro
Focus Point
F/8.0
Brightness 171
(Almost Same)
Sigma 17-70 F/2.8-4 DS Macro HSM
Focus Point
F/8.0
Brightness 173
(Almost Same)
Black & White crops are displayed for better details study.
Click here to switch back to colored crops.
  EXIF  
 
Custom Comparison
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  Other Sigma 17-70 F/2.8-4 DS Macro HSM vs. Sigma 50mm F/2.8 DG Macro Comparisons  
Sigma 17-70 vs. Sigma 50mm 2.8
Sharpness at 50mm.
Tested Apertures F2.8/F4, F3.5/F4, F4, F4.5, F5, F5.6, F6.3, F7.1, F8, F9, F10, F11
Sigma 50mm 2.8 vs. Sigma 17-70
Sharpness at 50mm.
Tested Apertures F2.8/F4, F3.5/F4, F4, F4.5, F5, F5.6, F6.3, F7.1, F8, F10
Sigma 17-70 vs. Sigma 50mm 2.8
Sharpness at 50mm.
Tested Apertures F2.8/F4, F3.5/F4, F4, F4.5, F5, F5.6, F6.3, F7.1, F8
Sigma 17-70 vs. Sigma 50mm 2.8
Sharpness at 50mm.
Tested Apertures F2.8/F4, F4, F5, F5.6, F6.3, F8, F10
Sigma 17-70 vs. Sigma 50mm 2.8
Sharpness at 50mm.
Tested Apertures F2.8/F4, F4/F4.5, 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