Optical Instrument Lens

Features

Specifications

• Diameter:
  Between 0.686 inches and 0.689 inches
• Axial Thickness:
  0.236 inches and 0.024 inches
• Compound Lensaxial Thickness:
  Between 0.240 inches and 0.272 inches
• Compound Lens Edge Thickness:
  0.166 inches
• Equivalent Focal Length:
  1.444 inches
• Back Focal Length:
  1.281 inches
• Refraction Index:
  1.5411 and 1.6210
• Abbe Constant:
  59.900 and 36.200
• Compound Lens Style:
  Doublet
• Individual Lens Style:
  Double convex and meniscus diverging
• Element Left Surface Radius:
  0.793 inches and -0.595 inches
• Element Right Surface Radius:
  -0.595 inches and -4.220 inches
• Material:
  Glass, optical, mil-g-174, grade c, type 541-599 or glass, optical, mil-g-174, grade c, type 621-362
• Fsc Application Data:
  Binocular, m7, m16
• Federal Supply Class (fsc):
  Optical instruments, test equipment, components and accessories
• National Stock Number (nsn):
  6650-00-520-4253
• Special Features:
  Reflection reducing treatment on front andback surfaces, jan-m-621