Optical Instrument Lens

Features

Specifications

• Diameter:
  0.590 inches
• Axial Thickness:
  0.118 inches and 0.059 inches
• Compound Lensaxial Thickness:
  0.177 inches
• Compound Lens Edge Thickness:
  0.156 inches
• Equivalent Focal Length:
  4.204 inches
• Back Focal Length:
  4.165 inches
• Front Focal Length:
  4.133 inches
• Refraction Index:
  1.5720 and 1.6170
• Abbe Constant:
  57.400 and 36.600
• Compound Lens Style:
  Doublet
• Individual Lens Style:
  Double convex and meniscus diverging
• Element Left Surface Radius:
  -1.283 inches and 3.449 inches
• Element Right Surface Radius:
  -1.283 inches and -5.724 inches
• Material:
  Glass, optical, jan-g-174, grade c
• Fsc Application Data:
  Fire control, range finder, mk 57
• Federal Supply Class (fsc):
  Optical instruments, test equipment, components and accessories
• National Stock Number (nsn):
  6650-00-155-1710