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Polarizing filters test 2015

1 November 2015
Szymon Starczewski

11. Braun Starline Slim Circular PL

Polarizing filters test 2015 - Braun Starline Slim 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 Starline Slim Circular PL

  • Red color extinction coefficient: 2.06e-2; Score: 0.5/4
  • Green color extinction coefficient: 1.29e-2; Score: 0.5/4
  • Blue color extinction coefficient: 5.24e-2; Score: 0/4
  • Mean transmission of the whole spectrum: 39.86% Score: 2.97/3
    Score: 3.97 / 11 pts
Flares

Polarizing filters test 2015 - Braun Starline Slim Circular PL
Without filter

Polarizing filters test 2015 - Braun Starline Slim Circular PL
With filter

Score: 0 / 7.5 pts

Scattering

Polarizing filters test 2015 - Braun Starline Slim Circular PL

  • Luminance: 155.69
    Score: 0 / 5 pts
Vignetting
  • Vignetting difference: 5.37%
    Score: 2.57 / 5 pts
Homogeneity

Polarizing filters test 2015 - Braun Starline Slim Circular PL

  • Slight flaws in homogeneity, one defect
    Score: 4 / 5 pts

Final score: 10.5 / 37.5 pts (28.1%)

  • Overall ranking: 20th place
  • Econo-ranking: 23th place

Design, usage and summary

The ring is screwed-on but very slack. It practically hasn’t been greased at all so it moves too loosely, it is uneven and loud. The surfaces aren’t coated. In the box there is a little bag with a hygroscopic substance. The filter makes a rather shoddy impression.

The spectrum characteristics are practically flat across the whole visible spectrum and infrared as well. Still the extinction coefficients are weak which might lead to a violet- purple hue of damped down reflections. The filter becomes translucent in infrared very quickly.