Op­ti­cal fil­ters for B& w

Digital SLR Photography - - The Beginner ’s Guide -

if you were shoot­ing with black & white film, you’d be us­ing fil­ters on the front of your lens to con­trol the con­trast of your im­ages, the most pop­u­lar be­ing yel­low, or­ange, red and green. they work by chang­ing the way the colours trans­late to grey by light­en­ing the colours close to them and dark­en­ing com­ple­men­tary colours. for in­stance, the or­ange fil­ter light­ens ar­eas of or­ange while dark­en­ing ar­eas of blue, mak­ing it pop­u­lar for en­hanc­ing blue skies. nowa­days these fil­ters are al­most re­dun­dant as they can neg­a­tively af­fect ex­po­sures. sev­eral cam­eras of­fer the equiv­a­lent fil­ter ef­fects in- cam­era to ap­ply dig­i­tally when us­ing mono­chrome mode. here’s a run­down of what each colour fil­ters do…

yel­low: light­ens warm and dark­ens cool colours. in­crease in con­trast tends to be sub­tle.

red: blue skies go black and greens darken, clouds are stark and con­trast be­come dra­matic as it light­ens warm tones.

or­ange: like yel­low, it light­ens warm colours and dark­ens cool ones but the con­trast is sig­nif­i­cantly stronger.

Greens: light­ens greens and blues, whilst dark­en­ing warmer colours. use­ful for land­scapes where you want to sep­a­rate green tones.

Blue: greens and blues are light­ened while warm colours be­come darker.

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