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Macro Photography, also known as close-up photography, is the photography of small objects. A macro lens is a lens that offers a magnification of either 1:1, (1x) or sometimes only 1:2 reproduction.
Most lenses that achieve 1:1 reproduction are named macro lenses, however Nikon uses the term Micro to describe their 1:1 reproduction lenses. This is because of the official definitions of the two words, and how they actually relate to lens magnification or reproduction. Outside of photography, macro means large, while micro means small. In the realm of photography and camera lenses, some manufacturers used the term macro because they wanted to denote a lens that could make small things appear large, despite the fact that most macro lenses do not exceed 1:1 reproduction, and therefore are not actually making the subject larger than life, but merely life-size.