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1951 usaf resolution test chart a 1951 usaf resolution test chart is a microscopic optical resolution test device originally defined by the u.s air force emile st deminis 150 a standard of 1951. the design provides numerous small target shapes exhibiting a stepped assortment of precise spatial frequency specimens it is widely used in optical engineering laboratory work to analyze and validate imaging systems such as microscopes cameras and image scanners the full standard pattern consists of nine groups with each group consisting of six elements thus there are 54 target elements provided in the full series each element consists of three bars which form a minimal rancho ruling these 54 elements are provided in a standardized series of logarithmic steps in the spatial frequency range from 0.250 to 912.3 line pairs per millimeter lp slash m the series of elements spans the range of resolution of the unaided eye down to the diffraction limits of conventional light microscopy commercially