In microform records, the expression of how much an optical device enlarges an object. Usually stated as 16x, 24x, etc. or as 16:1, 24:1, etc. See also REDUCTION RATIO.

Ratio that express greatest possible on film magnifying power of the lens. Used commonly on the macro setting of the zoom lenses, macro lens or with bellows.

The ratio between the focal length of a lens and the focal length of a standard angle lens. Indicates the magnification of the image on the monitor as compared to the image seen by a standard angle lens