Close-up lens
Secondary lens used to enable macro photography / From Wikipedia, the free encyclopedia
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In photography, a close-up lens (sometimes referred to as close-up filter or a macro filter) is a simple secondary lens used to enable macro photography without requiring a specialised primary lens. They work like reading glasses, allowing a primary lens to focus more closely.[1] Bringing the focus closer allows the photographer more possibilities.[2]
Close-up lenses typically mount on the filter thread of the primary lens,[3] and are often manufactured and sold by suppliers of photographic filters. Nonetheless, they are lenses and not filters. Some manufacturers refer to their close-up lenses as diopters, after the unit of measurement of their optical power.
Close-up lenses do not affect exposure, unlike extension tubes, which also can be used for macro photography with a non-macro lens.[4]