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Polarizing filters test 2015

1 November 2015
Szymon Starczewski

21. NiSi DUS Ultra Slim PRO C-PL

Polarizing filters test 2015 - NiSi DUS Ultra Slim PRO C-PL

NiSi is a young Chinese company specializing in photographic filters. They were launched on the market not long before the publication of our first test. It’s worth checking whether their brand name competitors have anything to worry about.


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Results of the test

Transmission and extinction coefficient

Polarizing filters test 2015 - NiSi DUS Ultra Slim PRO C-PL

  • Red color extinction coefficient: 1.82e-2; Score: 0.5/4
  • Green color extinction coefficient: 7.37e-4; Score: 3/4
  • Blue color extinction coefficient: 6.87e-3; Score: 1/4
  • Mean transmission of the whole spectrum: 39.3% Score: 2.86/3
    Score: 7.36 / 11 pts
Flares

Polarizing filters test 2015 - NiSi DUS Ultra Slim PRO C-PL
Without filter

Polarizing filters test 2015 - NiSi DUS Ultra Slim PRO C-PL
With filter

Score: 3 / 7.5 pts

Scattering

Polarizing filters test 2015 - NiSi DUS Ultra Slim PRO C-PL

  • A little bit strange, anisotropic scattering.
  • Luminance: 70.13
    Score: 2.96 / 5 pts
Vignetting
  • Vignetting difference: 3.65%
    Score: 3.53 / 5 pts
Homogeneity

Polarizing filters test 2015 - NiSi DUS Ultra Slim PRO C-PL

  • Small streakiness
    Score: 4 / 5 pts

Final score: 20.9 / 37.5 pts (55.6%)

  • Overall ranking: 18th place
  • Econo-ranking: 21th place

Design, usage and summary

The ring fits well but its resistance while turning is a bit uneven. The filter is glued in or pressed (it’s hard to say). Despite the lack of multi-coatings it is difficult to clean. The box is not ergonomic to say the least of it.

Flat spectrum characteristics with a small decrease at the short-wave end. Good damping down of green, a bit worse in the case of red. The amount of unwanted light which passes through remains still small. The filter becomes translucent in infrared very quickly.