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Polarizing filters test

10 August 2009
Szymon Starczewski

21. Kenko PRO1D Wide Band C-PL(W) 72 mm

Polarizing filters test - Kenko PRO1D Wide Band C-PL(W) 72 mm
Polarizing filters test - Kenko PRO1D Wide Band C-PL(W) 72 mm
Kenko PRO1D Wide Band C-PL(W) 72 mm
Price: 219 PLN


The Japanese company Kenko produces industrial and functional optics including converters, light meters and even analogue SLR cameras. Kenko has something to do not only with Tokina… We couldn’t help but get the impression that these filters came from the same production line. Perhaps the test will tell us some more?

Results of the test

Transmission and extinction coefficient
Polarizing filters test - Kenko PRO1D Wide Band C-PL(W) 72 mm

- - - - - - - - - - - - - - - - - advertisement - - - - - - - - - - - - - - - - -

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Red color extinction coefficient: 1.14E-4 - Score: 3.5/4
Green color extinction coefficient: 1.69E-4 - Score: 3.5/4
Blue color extinction coefficient: 3.57E-3 - Score: 2/4
Mean transmission of the whole spectrum: 30.37% - Score: 1.07/3
Score:
10.07/15
Flares
Without filter
Polarizing filters test - Kenko PRO1D Wide Band C-PL(W) 72 mm

With filter
Polarizing filters test - Kenko PRO1D Wide Band C-PL(W) 72 mm

Score:
6/7.5
Scattering
Polarizing filters test - Kenko PRO1D Wide Band C-PL(W) 72 mm

Luminance: 14.6
Score:
5/5
Vignetting
Edge darkening: 5.1%
Score:
2.72/5
Homogeneity
Polarizing filters test - Kenko PRO1D Wide Band C-PL(W) 72 mm

Slight flaw in homogeneity
Score:
4.5/5
Final score
Overall ranking: 4th place
Econo-ranking: 4th place
28.3/37.5 pts (75.5 %)
1.35 pts

Usage

The ring turns smoothly with noticeable resistance, maybe slightly too large. The filter didn’t cause any worries during the test, apart from one oppressive streak. The filter didn’t get scratched, although no one really bothered to avoid it.

Summary

4th place in the overall ranking (28.3/37.5)
The transmission curve and the coefficient of extinction are identical to the twin model. Flares, mean transmission, scattering and vignetting likewise. C1 and C2 graphs are different than competition’s products. Their shape is preserved, it’s angles of inclination that changed. It’s possible that the phase retardation is slightly bigger or the quarter-wave plate has a flattened dispersion. In such case the polarizer would be circular in a wider spectrum and that would explain the “wide band” in its name. If that’s the truth (and everything points at it) then it deserves praise. Kenko was also better at homogeneity test. This suggests that Hoya uses cheaper and less homogeneous quarter-wave plates. This caused that Kenko is 3 places higher than Hoya.

Filter for tests was lent by Cyfrowe.pl