Optical Instrument Lens

Features

Specifications

• Diameter:
  1.378 inches
• Axial Thickness:
  0.276 inches and 0.118 inches
• Compound Lensaxial Thickness:
  0.394 inches
• Compound Lens Edge Thickness:
  0.340 inches
• Equivalent Focal Length:
  8.726 inches
• Back Focal Length:
  8.515 inches
• Front Focal Length:
  8.688 inches
• Refraction Index:
  1.5740 and 1.6210
• Abbe Constant:
  57.700 and 36.600
• Compound Lens Style:
  Doublet
• Individual Lens Style:
  Double convex and meniscus diverging
• Element Left Surface Radius:
  -2.958 inches and 5.630 inches
• Element Right Surface Radius:
  -2.958 inches and -13.780 inches
• Material:
  Glass, optical, mil-g-174, class 1, grade c
• Material Specification:
  Mil-g-174, class 1, grade c military specification single material response
• Fsc Application Data:
  Fire control, telescope, mk66
• Federal Supply Class (fsc):
  Optical instruments, test equipment, components and accessories
• National Stock Number (nsn):
  6650-00-382-1875