36. FILTERS
THERE ARE MANY different filters available in the world of photography. Two common filters that affect the exposure of a scene are neutral density filters and split neutral density filters.
Neutral Density Filter
The neutral density (ND) filter is a dark gray filter used to reduce the amount of light entering the lens without any change in color. This can become a fourth way of controlling light, after shutter speed, aperture, and ISO. This filter is used for two very different photographic needs.
If you want to take very long exposures in normal daylight, you’d set a low ISO (100 or 200), stop your aperture down to its smallest settings ...
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