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Polarizing filters test

10 August 2009
Szymon Starczewski

18. Hoya HMC PL-CIR 72 mm

Polarizing filters test - Hoya HMC PL-CIR 72 mm
Polarizing filters test - Hoya HMC PL-CIR 72 mm
Hoya HMC PL-CIR 72 mm
Price: 215 PLN


One of the most famous producers of photographic filters, ocular lenses, contact lenses and other optical components. It was established in Japan in 1941. The fact that it absorbed Pentax at the end of March, 2008, may prove its power. In UV filters test Hoya had three first places in the overall ranking and four in the econo-ranking. Now it’s time for circular polarizers, will Hoya be the dark horse again?

Results of the test

Transmission and extinction coefficient
Polarizing filters test - Hoya HMC PL-CIR 72 mm


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Red color extinction coefficient: 1.96E-4 - Score: 3.5/4
Green color extinction coefficient: 2.56E-4 - Score: 3.5/4
Blue color extinction coefficient: 8.54E-3 - Score: 1/4
Mean transmission of the whole spectrum: 30.87% - Score: 1.17/3
Score:
9.17/15
Flares
Without filter
Polarizing filters test - Hoya HMC PL-CIR 72 mm

With filter
Polarizing filters test - Hoya HMC PL-CIR 72 mm

Score:
5.25/7.5
Scattering
Polarizing filters test - Hoya HMC PL-CIR 72 mm

Luminance: 14.4
Score:
5/5
Vignetting
Edge darkening: 4%
Score:
3.33/5
Homogeneity
Polarizing filters test - Hoya HMC PL-CIR 72 mm

Circular streak visible
Score:
3.5/5
Final score
Overall ranking: 9th place
Econo-ranking: 12th place
26.3/37.5 pts (70.1 %)
-0.62 pts

Usage

The ring turns smoothly with an appropriate resistance. The filter didn’t cause any trouble.

Summary

9th place in the overall ranking (26.3/37.5)
The transmission curve is flat up to 700 nm, at the end of the visible spectrum the transmission’s increase reaches 10%. The extinction coefficient of about 2/10000 is very good for a foil polarizer. C1 and C2 graphs indicate that we’re dealing with a quarter-wave plate of zeroth order designed for the middle of visible spectrum. Perhaps the HMC layers protect well against scratches (not tested), but they’re not excellent at flares’ reduction. It’s difficult to determine the influence of the streaks on resolution, it would require thorough tests.

Filter for tests was lent by Fotozakupy.pl