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8" Diameter Cervit Low Expansion Telescope mirror blank ~ 1 3/8" thick as pictured. Lower expansion coefficient than Pyrex / borosilicate glass.  One side flat, one side very slightly concave.  Sagitta approx .015" (focal length approx. 256" or f32). Weighs approx 2812 grams (6 lb 3.2 oz). Shipped with USPS Priority Mail.

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