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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.
When used for macro photography and done at a professional level, focus stacking is a precise and exacting process that can require very specialized equipment like an automated focus stacking macro rail and would need to be done in a highly controlled studio setting.