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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 MIL-STD-150A standard of 1951. The design provides numerous small target shapes exhibiting a stepped assortment of precise... Wikipedia
1951 USAF, NBS 1952 & 1963A, Sector Star, Ronchi Ruling, and Variable Line Grating Targets. Combined Resolution & Distortion Target, High-Contrast Positive Reflective Versions Avail. OEM & Customs. 20,000+ Photonics Items.