Polarizing filters test - supplement
6. King Digital Slim MC C-PL 72 mm
On the Polish market, the King company’s offer is limited to caps, UV filters and polarized filters. Although the products are cheap, the “Made in Japan” inscription makes people trust their quality more.
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Results of the test
Red color extinction coefficient: 7.13E-2 - Score: 1/4
Green color extinction coefficient: 7.44E-2 - Score: 3/4 Blue color extinction coefficient: 3.02E-2 - Score: 0.5/4 Mean transmission of the whole spectrum: 38.24% - Score: 2.65/3 Score:
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With filter Score:
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Luminance: 32.1
Score:
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Edge darkening: 1.95% Score: |
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Significant heterogeneities
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Usage
During the test we didn’t notice any problems with the filter. It moves smoothly and easily, it seems to be solidly build.
Summary
Final result: 22.2/37.5 points. The filter would be placed almost at the very end of the overall ranking (17th place). The transmission curve is flat up until the blue color. In the long wavelength area (infrared) the polarization direction changes by 90 degrees. Although this phenomenon doesn’t influence the normal work of the filter, it is interesting from the optics point of view (it is difficult to explain why it happens).The 1/1000 extinction coefficient is typical for foil polarizers. This value changes significantly with the change of the wavelength. The C1 and C2 graphs indicate that we’re dealing with a zero-order quarter-wave plate designed for the middle range of visible spectrum.
The most serious slip-up of the King was homogeneity. When it comes to the quality of used materials, it is a bad sign . Apart from that, this filter’s results were not particularly outstanding in any of the categories – they represent an average level and I suppose this is the right place for this polarizer.
The tested filter was lent courtesy of the Foto-Tip company.