DIN 19051-2 Bb.2-2013
缩微照相用检验样品. 第2部分:以分辨为目的的可读性试验和试验表用印刷字符基本组合; 补充件2:旋转相机实际使用的测试卡
Test charts for micrography - Part 2: Fundamental assembly of typographical characters for legibility tests and test chart for destination of resolving power; Supplement 2: Test card for practical use in rotary cameras
