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Biconcave LensesBiconcave Lenses have negative focal lengths. They are often used to expand light or increase focal lengths in existing systems. Specification: Material: Crown glass, high index glass, or custom materialsFocal length: +/-1%Diameter: +0.0/-0.03Center thickness: +/-0.05Centering Accuracy: 1"Figure (sphericity): 1~3Surface Quality: 40/20Coating: Optional

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