Digital SLR Photography - - The Beginner ’s Guide -

Cer­tain op­ti­cal fi fil­ters lters al­low you to con­trol the con­trast of your black & white im­ages ( see page 70), much the same way as you can dig­i­tally us­ing colour chan­nels and HSL ( Hue, Sat­u­ra­tion and Lu­mi­nance) ad­just­ments ( see page 78). But there are a few op­ti­cal fil­ters whose ef­fects can­not be eas­ily repli­cated and are es­sen­tial for land­scapes:

GRAD­U­ATED NEU­TRAL DEN­SITY When skies are bland or you want to make a brood­ing storm bolder, ND grads are key. They re­duce the dif­fer­ence in bright­ness be­tween the sky and land, bal­anc­ing the ex­po­sure, the sky is also cor­rect. For dra­matic re­sults that darken the sky try stronger den­sity ND grads such as the 0.9ND or, to con­trol a bright sky for a more bal­anced scene, a 0.6ND.

PO­LAR­IS­ING FIL­TER Like a red fil­ter, a po­lariser dark­ens blue skies mak­ing clouds ‘ pop’, in­creases con­trast and clar­ity, as well as re­mov­ing glare and re­flec­tions from water and shiny sur­faces. It’s an in­cred­i­bly use­ful fil­ter to have in your kit bag.

NEU­TRAL DEN­SITY FIL­TER ND fil­ters al­low you to in­crease the ex­po­sure so you can record move­ment in the land­scape. Den­si­ties such as 0.6, 0.9 and 1.2ND are use­ful for blur­ring fast mov­ing water, but ex­treme NDS al­low you to cre­ate sim­ple scenes us­ing long ex­po­sures in day­light to cap­ture mo­tion.

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