Image quality filters utilizing high-quality optical glass

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In response to the need for high quality filters, Andover has developed the "Image Quality Filter". Our image quality filters utilize high-quality optical glass, typically Schott® BK-7 and Schott® filter glass. The surfaces of this material are ground and polished to a flatness of 1/4 wave per inch and parallel to 30 arc seconds or better. If necessary, a higher degree of optical quality is available for the more critical applications. To prevent fringe patterns and multiple images, all coatings are deposited onto a single surface and all exterior surfaces are broadband anti-reflection coated for an average reflection of <=0.5%.

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