Canon EF-S 17-55mm f/2.8 IS USM on Canon EOS 400D, DIGITAL REBEL Xti or Kiss Digital X vs Sigma 17-50mm F2.8 EX DC OS HSM Canon on Canon EOS 400D, DIGITAL REBEL Xti or Kiss Digital X vs Tamron SP 24-70mm F2.8 Di VC USD Canon on Canon EOS 400D, DIGITAL REBEL Xti or Kiss Digital X

COMPARISON SELECTION (3 selected items max.)

DXOMARK Score

Best at f=35mm & f/2.8 [?]
11

Lens Metric Scores

Sharpness [?]
6 P-Mpix
Transmission [?]
3.5 TStop
Distortion [?]
0.4 %
Vignetting [?]
-1.1 EV
Chr. aberration [?]
6 µm

DXOMARK Score

Best at f=21mm & f/2.8 [?]
12

Lens Metric Scores

Sharpness [?]
5 P-Mpix
Transmission [?]
3.1 TStop
Distortion [?]
0.3 %
Vignetting [?]
-0.7 EV
Chr. aberration [?]
11 µm

DXOMARK Score

Best at f=70mm & f/2.8 [?]
14

Lens Metric Scores

Sharpness [?]
6 P-Mpix
Transmission [?]
2.8 TStop
Distortion [?]
0.2 %
Vignetting [?]
-0.3 EV
Chr. aberration [?]
3 µm