Tamron SP 17-50mm F/2.8 Di II XR VC LD Aspherical IF Canon on Canon EOS 500D, DIGITAL REBEL T1i or Kiss Digital X3 vs Sigma 17-50mm F2.8 EX DC OS HSM Canon on Canon EOS 500D, DIGITAL REBEL T1i or Kiss Digital X3 vs Sigma 18-50mm F2.8-4.5 DC OS HSM Canon on Canon EOS 500D, DIGITAL REBEL T1i or Kiss Digital X3

COMPARISON SELECTION (3 selected items max.)
Tamron SP 17-50mm F/2.8 Di II XR VC LD Aspherical IF Canon
Tamron SP 17-50mm F/2.8 Di II XR VC LD Aspherical IF Canon

DXOMARK Score
Best at f=17mm & f/2.8 [?]
12

Lens Metric Scores

Sharpness [?]
8 P-Mpix
Transmission [?]
3.3 TStop
Distortion [?]
0.3 %
Vignetting [?]
-0.7 EV
Chr. aberration [?]
6 µm
Sigma 17-50mm F2.8 EX DC OS HSM Canon
Sigma 17-50mm F2.8 EX DC OS HSM Canon

DXOMARK Score
Best at f=21mm & f/2.8 [?]
14

Lens Metric Scores

Sharpness [?]
7 P-Mpix
Transmission [?]
3.1 TStop
Distortion [?]
0.3 %
Vignetting [?]
-0.7 EV
Chr. aberration [?]
11 µm
Sigma 18-50mm F2.8-4.5 DC OS HSM Canon
Sigma 18-50mm F2.8-4.5 DC OS HSM Canon

DXOMARK Score
Best at f=18mm & f/2.8 [?]
9

Lens Metric Scores

Sharpness [?]
6 P-Mpix
Transmission [?]
4.1 TStop
Distortion [?]
0.4 %
Vignetting [?]
-0.9 EV
Chr. aberration [?]
10 µm