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Polarizing filters test 2015

1 November 2015
Szymon Starczewski

18. Marumi EXUS Circular P.L

Polarizing filters test 2015 - Marumi EXUS Circular P.L

In our first test of polarizers the Marumi products fared exceedingly well, especially if you take into account their moderate price. Let’s see whether that result can be defended now by a new bunch of filters.


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Results of the test

Transmission and extinction coefficient

Polarizing filters test 2015 - Marumi EXUS Circular P.L

  • Red color extinction coefficient: 4.38e-2; Score: 0.5/4
  • Green color extinction coefficient: 7.56e-4; Score: 3/4
  • Blue color extinction coefficient: 7.12e-3; Score: 1/4
  • Mean transmission of the whole spectrum: 43.77% Score: 3/3
    Score: 7.5 / 11 pts
Flares

Polarizing filters test 2015 - Marumi EXUS Circular P.L
Without filter

Polarizing filters test 2015 - Marumi EXUS Circular P.L
With filter

Score: 7.5 / 7.5 pts

Scattering

Polarizing filters test 2015 - Marumi EXUS Circular P.L

  • Luminance: 8.68
    Score: 5 / 5 pts
Vignetting
  • Vignetting difference: 2.86%
    Score: 3.97 / 5 pts
Homogeneity

Polarizing filters test 2015 - Marumi EXUS Circular P.L

  • Without reservation
    Score: 5 / 5 pts

Final score: 29.0 / 37.5 pts (77.3%)

  • Overall ranking: 3rd place
  • Econo-ranking: 14th place

Design, usage and summary

The fitler is composed of good quality rings and it turns with slight resistance. You can feel a bit of slack. The marker of the polarization’s azimuth doesn’t tally with the real values, differing by 5 degrees but such a deviation doesn’t make the work more difficult. Surfaces covered by broadband multi-coatings which are really hard to polish to perfection.

A flat transmission graph can be observed for most of the visible spectrum with a slight decrease for blue colour (might cause a bit of warming of images). The extinction coefficient in the centre of the spectrum is good for a foil polarizer but a part of red and violet light passes through. In some unique cases it might cause purplish hue of damped down reflections but that effect should be marginal. The polarizer stops working in infrared very quickly, becoming translucent. A mean light transmission amounts to near 44% and is one of the highest in the test. If you add to that good optical quality you get a very deserved third place in our ranking.