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The polarizing filter from K+F darkened from ISO160 to ISO400 in the test and produced a green tint, which is rather normal for polarizing filters and is reasonable for this price. However, the resulting blurring is too strong for me. It is not a slim filter, and so it can produce vignettes depending on the lens. Stray light is reduced as usual. Tests were carried out on new fixed focal lengths, zoom lenses and old glass and always delivered similar results. The packaging is so clumsy that the filter should perhaps simply be left on the lens when hiking. I basically ask myself whether the effect achieved can justify the blurriness and advise a higher-quality product (e.g. from Gobe).
24/11/2021