Proceedings PaperOptical Black Coating
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In the optical design of most sunshields, baffles are used to prevent stray light reflected by the interior surfaces of the sunshield from reaching the optical system entrance pupil directly. This improves the performance of the sunshield. However, it is usually impossible to eliminate all light reflected by the edges of the baffles themselves; thus these edges must be designed to reflect the minimum light possible. Martin Marietta's design for baffle edges, using the black surface reflected five to eight times less light than edges of true razor blades, the previous standard for baffle edges. The graph compares the light reflected from the baf-fle edges and from razor edges as a function of the angle of reflection. No baffle edges known to date have exceeded the performance of razor edges.