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Target USAF 2"X2" 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 0, Element 1 (1.00 lp/mm) through Group 7, Element 6 (228 lp/mm). Used to determine resolution and contrast. Negative Target: Clear bars on an opaque field.Printed on fused silica to allow high transmittance of Ultraviolet Light (>92%@270nm). The pattern is printed 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 and specifications are available under “Detailed Specifications” below. Click here to download drawing Show more