What are Macro lenses?

Macro lenses are those which can focus unusually close, providing large reproduction ratios (e.g. 1:3, 1:2, 1:1, etc.) Sigma offers more lenses with macro capabilities than any other lens or camera maker. The choice of which lens to use depends on the application.
The shorter lenses, 50mm and 105mm provide greater magnification (reproduction ratio) capabilities (1:1 without accessory), and shorter working distances. These are desirable for photographing inanimate or slow moving subjects or for copy work. The 105mm f/2.8 EX Macro lens can also be useful for portraiture.
Longer Macro lenses like the 180mm f3.5 EX APO Macro can allow even greater working distance while still providing up to 1:1 reproduction. Greater working distances are useful when photographing animate subjects which may become evasive or aggressive if approached closely by a photographer.
Sigma offers several zoom lenses (e.g. 70-300mm F4-5.6 DG Macro) which combine reproduction ratios up to 1:2 with the convenience and versatility of a zoom lens. These can be invaluable for general photography including extreme close-ups, while carrying only one lens around.

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