Go slow

NPhoto - - Test Team -

01

02 In the round

03 Be a square

04 Get an an­gle

05 Size and price

When ad­justed for max­i­mum po­lar­i­sa­tion, the amount of light pass­ing through the fil­ter is re­duced, usu­ally by about two f/stops. Round screw-in fil­ters that at­tach di­rectly to the lens are more con­ve­nient but, if you usu­ally have a pro­tec­tion or UV fil­ter fit­ted, it’s best to re­move this to in­crease qual­ity and avoid vi­gnetting. A key ad­van­tage of square or rec­tan­gu­lar cir­cu­lar po­lariser fil­ters that fit into a fil­ter holder is that you can usu­ally add a grad­u­ated neu­tral den­sity fil­ter for land­scape shoot­ing. For inky blue skies, the po­lar­i­sa­tion ef­fect is most ap­par­ent when shoot­ing at right-an­gles to the sun. With ul­tra-wide lenses, the strength of the ef­fect tends to vary no­tice­ably across the frame. When buy­ing round fil­ters that at­tach di­rectly to lenses, larger sizes are usu­ally more ex­pen­sive. Prices quoted in our re­views are for 77mm at­tach­ment threads.

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