Canon EF 300mm f/2.8L IS USM on Canon EOS 7D vs Pentax smc DA Star 300mm F4 ED (IF) SDM on Pentax K-50

COMPARISON SELECTION (3 selected items max.)
Canon EF 300mm f/2.8L IS USM
Canon EF 300mm f/2.8L IS USM

DXOMARK Score
Best at f=300mm & f/4 [?]
17

Lens Metric Scores

Sharpness [?]
15 P-Mpix
Transmission [?]
3.3 TStop
Distortion [?]
0 %
Vignetting [?]
-0.5 EV
Chr. aberration [?]
4 µm
Pentax smc DA Star 300mm F4 ED (IF) SDM
Pentax smc DA Star 300mm F4 ED (IF) SDM

DXOMARK Score
Best at f=300mm & f/5.6 [?]
17

Lens Metric Scores

Sharpness [?]
8 P-Mpix
Transmission [?]
4.4 TStop
Distortion [?]
0.1 %
Vignetting [?]
-0.5 EV
Chr. aberration [?]
6 µm