Optical Instrument Lens

Features

Specifications

• Diameter:
  1.772 inches
• Axial Thickness:
  0.827 inches
• Compound Lens Edge Thickness:
  0.534 inches
• Equivalent Focal Length:
  2.905 inches
• Back Focal Length:
  2.967 inches
• Front Focal Length:
  2.333 inches
• Refraction Index:
  1.5744 and 1.6489
• Abbe Constant:
  57.700 and 33.800
• Compound Lens Style:
  Doublet
• Individual Lens Style:
  Double convex and plano-concave
• Material:
  Glass, optical, jan-g-174, grade c
• Fsc Application Data:
  Fire control, periscope mk 23
• Federal Supply Class (fsc):
  Optical instruments, test equipment, components and accessories
• National Stock Number (nsn):
  6650-00-382-1962