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Polarizing filters test 2015

1 November 2015
Szymon Starczewski

17. Hoya HRT CIR-PL UV

Polarizing filters test 2015 - Hoya HRT CIR-PL UV

The Hoya products have been enjoying a lot of popularity for years, mainly because of their very good price/quality ratio. This time we decided to test some cheaper models offered by this company.



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Results of the test

Transmission and extinction coefficient

Polarizing filters test 2015 - Hoya HRT CIR-PL UV

  • Red color extinction coefficient: 1.98e-2; Score: 0.5/4
  • Green color extinction coefficient: 4.67e-4; Score: 3.5/4
  • Blue color extinction coefficient: 6.14e-3; Score: 1/4
  • Mean transmission of the whole spectrum: 40.74% Score: 3/3
    Score: 8 / 11 pts
Flares

Polarizing filters test 2015 - Hoya HRT CIR-PL UV
Without filter

Polarizing filters test 2015 - Hoya HRT CIR-PL UV
With filter

Score: 3 / 7.5 pts

Scattering

Polarizing filters test 2015 - Hoya HRT CIR-PL UV

  • Luminance: 15.24
    Score: 4.99 / 5 pts
Vignetting
  • Vignetting difference: 4.49%
    Score: 3.06 / 5 pts
Homogeneity

Polarizing filters test 2015 - Hoya HRT CIR-PL UV

  • Without reservation
    Score: 5 / 5 pts

Final score: 24.1 / 37.5 pts (64.1%)

  • Overall ranking: 12th place
  • Econo-ranking: 12th place

Design, usage and summary

The ring is glued in or pressed, it’s hard to tell. An even, easy work with slight whirr. The marker of the polarizer’s azimuth indeed shows the direction of the polarization. No coatings on the surfaces of the filter and no reservations concerning the build quality either.

The first thing that sticks out is the name. A polarizing filter and an UV filter in one? An excellent idea! Still does it work? It must be honestly said that the second Hoya filter indeed lets through a lot of ultraviolet and it happens that only 7 filters out of 23 tested here do the same. Here the Hoya CIR-PL UV performs like 70% of tested models. The feature that was supposed to be distinctive is, in fact, a norm.

The spectrum characteristics are very similar to the one observed for the B+W KSM HTCM filters but the transmission is by about 4% lower. Using good coatings would most probably put both filters on equal level.