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Polarizing filters test 2015

1 November 2015
Szymon Starczewski

10. Braun Blueline Circular PL

Polarizing filters test 2015 - Braun Blueline Circular PL

Braun Phototechnik is a German company which has one hundred years of tradition under their belt. Their line-up is quite wide and diversified - among other things you can find there binoculars, small camcorders, scanners and other optical equipment. Up to now we failed to test products of that company so we are catching up.


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Results of the test

Transmission and extinction coefficient

Polarizing filters test 2015 - Braun Blueline Circular PL

  • Red color extinction coefficient: 1.02e-2; Score: 0,5/4
  • Green color extinction coefficient: 3.43e-4; Score: 3.5/4
  • Blue color extinction coefficient: 5.58e-3; Score: 1/4
  • Mean transmission of the whole spectrum: 39.33% Score: 2.87/3
    Score: 7.87 / 11 pts
Flares

Polarizing filters test 2015 - Braun Blueline Circular PL
Without filter

Polarizing filters test 2015 - Braun Blueline Circular PL
With filter

Score: 2.25 / 7.5 pts

Scattering

Polarizing filters test 2015 - Braun Blueline Circular PL

  • Luminance: 52.05
    Score: 2.66 / 5 pts
Vignetting
  • Vignetting difference: 5.22%
    Score: 2.66 / 5 pts
Homogeneity

Polarizing filters test 2015 - Braun Blueline Circular PL

Polarizing filters test 2015 - Braun Blueline Circular PL

  • Slight flaw in homogeneity, 6 small defects
    Score: 3 / 5 pts

Final score: 19.4 / 37.5 pts (51.8%)

  • Overall ranking: 19th place
  • Econo-ranking: 22th place

Design, usage and summary

The ring is screwed-on but slack, almost like in the Starline model. It hasn’t been greased at all so it movies unevenly, with too little resistance and it is loud. The surfaces aren’t coated. In the box I found a little bag with a hygroscopic substance – I admit I haven’t met with such a practice yet. The filter, like the Braun Starline, makes a rather shoddy impression.

A relatively high homogeneity mark stems from the fact that the surface area of visible defects, compared to the entire surface of the polarizer, is negligible. A flat spectrum characteristics from infrared to violet where the curve decreases by about 10% which might warm images slightly. A very good extinction coefficient in the centre of the visible spectrum, a bit worse on its edges but the amount of light which passes through is not big. The filter becomes transparent in infrared very quickly.