Optical Instrument Lens

Features

Specifications

• Diameter:
  1.583 inches
• Axial Thickness:
  0.500 inches and 0.157 inches
• Compound Lensaxial Thickness:
  0.657 inches
• Compound Lens Edge Thickness:
  0.409 inches
• Equivalent Focal Length:
  3.114 inches
• Back Focal Length:
  2.794 inches
• Front Focal Length:
  2.993 inches
• Refraction Index:
  1.5169 and 1.6488
• Abbe Constant:
  64.400 and 33.800
• Compound Lens Style:
  Doublet
• Individual Lens Style:
  Double convex and meniscus diverging
• Material:
  Glass, optical, jan-g-174, grade c
• Fsc Application Data:
  Fire control periscope mk 28, mod o, 1
• Federal Supply Class (fsc):
  Optical instruments, test equipment, components and accessories
• National Stock Number (nsn):
  6650-00-382-1963