Features
type 517-642 grade a class 1 mil-g-174 optical glass material.
Includes quality control certificate of conformance.
Specifications
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Diameter:
Between 4.195 inches and 4.199 inches
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Axial Thickness:
Between 0.488 inches and 0.492 inches
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Equivalent Focal Length:
11.988 inches
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Back Focal Length:
11.756 inches
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Front Focal Length:
11.895 inches
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Single Lens Style:
Double convex
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Element Left Surface Radius:
8.674 inches
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Element Right Surface Radius:
21.541 inches
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Fsc Application Data:
Target designator
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Federal Supply Class (fsc):
Optical instruments, test equipment, components and accessories
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National Stock Number (nsn):
6650-01-073-1737