Optical Instrument Lens

Features

Specifications

• Diameter:
  2.440 inches
• Axial Thickness:
  0.315 inches and 0.236 inches
• Compound Lensaxial Thickness:
  0.551 inches
• Compound Lens Edge Thickness:
  0.503 inches
• Equivalent Focal Length:
  31.656 inches
• Back Focal Length:
  31.212 inches
• Front Focal Length:
  31.555 inches
• Refraction Index:
  1.5170 and 1.6170
• Abbe Constant:
  64.500 and 36.600
• Compound Lens Style:
  Doublet
• Individual Lens Style:
  Double convex and meniscus diverging
• Element Left Surface Radius:
  -13.255 inches and 15.066 inches
• Element Right Surface Radius:
  -13.255 inches and -125.539 inches
• Material:
  Glass, optical, jan-g-174, grade c
• Fsc Application Data:
  Fire control, range finder mk 37 mod 5
• Federal Supply Class (fsc):
  Optical instruments, test equipment, components and accessories
• National Stock Number (nsn):
  6650-00-026-8134