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What Are Filters?

With traditional photography, filters are typically circles of glass that fit in front of a lens and change or attenuate the light passing through in some way. A few lenses with very large front diameters accept filters in a slot at the rear of the lens, to reduce the expense. My old fisheye lens has a few filters built in which can be changed by rotating a wheel. Filters also are available as inexpensive square sheets of gelatin that fit in holders that attach to the front of the lens.

Digital cameras, too, can use this kind of filter. Many digital camera lenses have threads on the front edge that accept conventional filters. Some cameras require a special adapter to let you mount filters.


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