Optical Instrument Lens

Features

Specifications

• Diameter:
  1.900 inches
• Axial Thickness:
  0.158 inches and 0.472 inches
• Compound Lensaxial Thickness:
  0.630 inches
• Compound Lens Edge Thickness:
  0.562 inches
• Equivalent Focal Length:
  13.161 inches
• Back Focal Length:
  12.454 inches
• Refraction Index:
  1.5725 and 1.5125
• Abbe Constant:
  42.500 and 60.500
• Compound Lens Style:
  Doublet
• Individual Lens Style:
  Meniscus diverging and meniscus converging
• Element Left Surface Radius:
  3.661 inches
• Element Right Surface Radius:
  1.705 inches
• Material:
  Glass, optical, mil-g-174, class 1, grade b
• Fsc Application Data:
  Periscope, integrated with fire control equipment
• Federal Supply Class (fsc):
  Optical instruments, test equipment, components and accessories
• National Stock Number (nsn):
  6650-00-766-0733