Optical filters for B& w
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.