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A lens assembly consisting of 4 lenses, spacer rings,a field stop and a retaining ring. The lens complement is composed of: a double convex 15.43 mm diameter, 63 mm focal length; a double concave 15.43 mm diameter, -59 mm focal length; a double concave 15.43 mm diameter, -68 mm focal length; a double convex 15.43 mm diameter, 52 mm focal length. The glass elements are all anti-reflection coated. Unused
