Optical Instrument Lens

Features

Specifications

• Diameter:
  Between 3.097 inches and 3.100 inches
• Axial Thickness:
  Between 0.297 inches and 0.317 inches and 0.705 inches and 0.725 inches
• Compound Lensaxial Thickness:
  Between 1.002 inches and 1.042 inches
• Equivalent Focal Length:
  16.560 inches
• Back Focal Length:
  15.807 inches
• Refraction Index:
  1.6490 and 1.5880
• Abbe Constant:
  33.800 and 53.400
• Compound Lens Style:
  Doublet
• Individual Lens Style:
  Double concave and double convex
• Element Left Surface Radius:
  143.191 millimeters
• Element Right Surface Radius:
  6.256 inches
• Material:
  Glass, optical, mil-g-174, class 1, grade c, type 649-338 and glass, optical, mil-g-174, class 1, grade c, type 588-534
• Fsc Application Data:
  Collimator
• Federal Supply Class (fsc):
  Optical instruments, test equipment, components and accessories
• National Stock Number (nsn):
  6650-00-119-3966
• Special Features:
  Front and back surfaces coated with magnesium fluoride