Polarizing filters test 2015
10. Braun Blueline Circular PL
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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
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 Without filter  With filter Score: 2.25 / 7.5 pts
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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.
