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Polarizing Filters –

reﬂ ection reduction par

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Radiant white clouds against a deep blue sky or saturated fall

colors are no coincidence. Polarizing ﬁ lters (pol ﬁ lters for short)

block the bluish gray veil from the diffusely polarized light of

the sky. They augment the purity of true colors and increase

color saturation. Polarizing ﬁ lters are amongst the most impor-

tant ﬁ lters in (digital) photography. They can be rotated in the

mount, allowing the visible regulation of the elimination effect

in the viewﬁ nder or on the display. The ﬁ lter factor is two to

three f-stops. The maximum effect is achieved at a shooting

angle of 90° to the sun. For an even effect in the picture, 35

mm (or 28 mm in 35 mm ﬁ lm format) should be the minimum.

The second beneﬁ cial effect of pol ﬁ lters is the reduction of

reﬂ ections on non-metallic surfaces (water, shop windows,

lacquer). Objects behind these surfaces, including writing

behind reﬂ ecting lacquer, are made visible – a fascinating way

to enhance images without using photo editing. Circular pol

ﬁ lters are recommended for digital cameras.

excellence

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B&W 65-030216 Fiche technique Page 14