- Close-up lens
photography, a close-up lens or close-up filter is a simple secondary lensused to enable macro photographywithout requiring a specialised primary lens. They work identically to reading glasses, allowing any primary lens to focus more closely.
Close-up lenses typically mount on the
filter threadof the primary lens, and are manufactured and sold by suppliers of photographic filters. Some manufacturers refer to their close-up lenses as "diopters", after the unit of measurement of their optical power.
While some single-element close-up lenses produce images with severe
aberrations, there are many inexpensive high-quality close-up lenses capable of producing excellent images; there is essentially no loss of sharpness when using these.
Photographic filter#Diopters and split diopters
* [http://www.imaginatorium.org/stuff/cufilter.htm What is a close-up filter?]
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