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Target USAF 3"X3" UV-Grade NEG For Vision/Optical systems and photography. Elements of two targets with three bars at right angles vary per MIL standard 150A from Group -2, Element 1 (0.25 lp/mm) through Group 7, Element 6 (228 lp/mm). Used to determine resolution and contrast. Negative Target: Clear bars on an opaque field.The target is printed on fused silica to allow high transmittance of Ultraviolet Light (>92%@270nm). The pattern is formed in durable double layer reflective Chromium on a stable Soda Lime glass substrate. The pattern is on top surface. (Right-reading looking through).Complete details are available under “Detailed Specifications” below. Click here to download drawing Show more