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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]
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![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/8/8d/Close-up.png/640px-Close-up.png)
- 1 - Close-up lens.
- 2 - Camera objective lens (set to infinity).
- 3 - Camera.
- 4 - Film or CCD plane.
- y - Object
- y" - Image
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/e/ea/Pentatomidae-clutch_hatched.jpg/640px-Pentatomidae-clutch_hatched.jpg)
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]