“ B+W 090 (24) - Filter - light red - 72 mm „
Color filters affect black and white films by darkening the complementary colors of a filter and their closely related colors on the color wheel while lightening its own color and those similar to it. The result is a clear differentiation of gray tones. In addition, the degree to which a filter suppresses colors depends on its density. For example, a dark filter blocks a larger percentage than a lighter filter.