Tamron SP AF 17-50mm F/2.8 XR Di II LD Aspherical [IF] Nikon on Nikon D7100 vs Sigma 17-50mm F2.8 EX DC HSM Pentax on Pentax K-3 vs Sigma 17-50mm F2.8 EX DC OS HSM Nikon on Nikon D7100

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

DXOMARK Score
Best at f=24mm & f/3.5 [?]
18

Lens Metric Scores

Sharpness [?]
12 P-Mpix
Transmission [?]
3.3 TStop
Distortion [?]
0.4 %
Vignetting [?]
-1 EV
Chr. aberration [?]
5 µm
Sigma 17-50mm F2.8 EX DC HSM Pentax
Sigma 17-50mm F2.8 EX DC HSM Pentax

DXOMARK Score
Best at f=50mm & f/2.8 [?]
21

Lens Metric Scores

Sharpness [?]
13 P-Mpix
Transmission [?]
3.1 TStop
Distortion [?]
0.3 %
Vignetting [?]
-1 EV
Chr. aberration [?]
9 µm
Sigma 17-50mm F2.8 EX DC OS HSM Nikon
Sigma 17-50mm F2.8 EX DC OS HSM Nikon

DXOMARK Score
Best at f=50mm & f/2.8 [?]
20

Lens Metric Scores

Sharpness [?]
14 P-Mpix
Transmission [?]
3.3 TStop
Distortion [?]
0.3 %
Vignetting [?]
-1.1 EV
Chr. aberration [?]
10 µm