Polarizing filters test
20. Hoya HMC Super 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: 2.29E-4 - Score: 3.5/4
Green color extinction coefficient: 3.21E-4 - Score: 3.5/4 Blue color extinction coefficient: 9.58E-3 - Score: 1/4 Mean transmission of the whole spectrum: 29.39% - Score: 0.88/3 Score:
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With filter Score:
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Luminance: 17.7
Score:
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| Edge darkening: 4.1% Score: |
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Circular streak visible
Score:
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Usage
The ring turns smoothly with an appropriate resistance. There were smudges of dirt visible on the filter, but they were easy to remove. The very narrow ring may not be convenient for everyone.
Summary
8th place in the overall ranking (26.6/37.5)The transmission curve is quite flat nearly up to 700 nm, after that it increases in the range of red. The extinction coefficient of about 3/10000 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. As you can see, once again in a Hoya product the grade of homogeneity has been lowered because of visible streaks. The influence of such streaks on worsening image’s resolution is not known to us. Very good extinguishing and small scattering weren’t enough to enter the first five. Points were lost on the mean transmission, flares and homogeneity.
Filter for tests was lent by Fotozakupy.pl
