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Polarizing filters test 2015

1 November 2015
Szymon Starczewski

23. Seagull CPL

Polarizing filters test 2015 - Seagull CPL

Probably many people are familiar with the brand and its logo. Seagull is a well-known producer of office equipment, at least in Poland. But under the same name brand hides also a producer of photographic accessories. The Seagull company is descended from Shanghai and it's already more than 50 years on the market. It is a typical representative of companies which are proud of their Chinese roots. In our first test there was a surprisingly good filter sold at similar price point so we decided to test another product of that company.


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Results of the test

Transmission and extinction coefficient

Polarizing filters test 2015 - Seagull CPL

  • Red color extinction coefficient: 2.29e-2; Score: 0.5/4
  • Green color extinction coefficient: 3.39e-4; Score: 3.5/4
  • Blue color extinction coefficient: 6.54e-3; Score: 1/4
  • Mean transmission of the whole spectrum: 39.21% Score: 2.84/3
    Score: 7.84 / 11 pts
Flares

Polarizing filters test 2015 - Seagull CPL
Without filter

Polarizing filters test 2015 - Seagull CPL
With filter

Score: 3 / 7.5 pts

Scattering

Polarizing filters test 2015 - Seagull CPL

  • Luminance: 9.28
    Score: 5 / 5 pts
Vignetting
  • Vignetting difference: 3.91%
    Score: 3.39 / 5 pts
Homogeneity

Polarizing filters test 2015 - Seagull CPL

  • Slight flaws in homogeneity
    Score: 4.5 / 5 pts

Final score: 23.7 / 37.5 pts (63.3%)

  • Overall ranking: 14th place
  • Econo-ranking: 5th place

Design, usage and summary

The filter is quite solid, with a screwed-on ring. Its performance is light and even but with distinct whirr and a slight axial slack. There are no coatings. For a low-cost product it makes a very solid impression.

Flat spectrum characteristics, a bit descending toward the short-wave end. A good extinction coefficient in the middle of the spectrum. The filter stops working in infrared very soon.