Polarizing filters test
17. Hoya PL-CIR 72 mm
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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
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Red color extinction coefficient: 8.14E-5 - Score: 4/4
Green color extinction coefficient: 9.78E-5 - Score: 4/4 Blue color extinction coefficient: 7.98E-3 - Score: 1/4 Mean transmission of the whole spectrum: 28.82% - Score: 0.76/3 Score:
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With filter Score:
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Luminance: 13.8
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| Edge darkening: 6% Score: |
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Slight streakiness
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Usage
The ring turns smoothly. The filter didn’t create any problems. There’s the azimuth of polarization marker on the ring.
Summary
14th place in the overall ranking (24/37.5)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 1/10000 is excellent for a foil polarizer. The filter records the best result of all here and may be the example to follow. However, the total transmission is the lowest among the tested filters. C1 and C2 graphs indicate that we’re dealing with a quarter-wave plate of zeroth order designed for the middle of visible spectrum. The final 14th place is a consequence of losing points mainly on flares and vignetting. If it hadn’t been for flares, this filter would be the best choice for working against really bright light.
Filter for tests was lent by Fotozakupy.pl
