Optical Instrument Lens

Features

Specifications

• Diameter:
  2.200 inches
• Axial Thickness:
  0.450 inches and 0.232 inches
• Compound Lensaxial Thickness:
  0.682 inches
• Compound Lens Edge Thickness:
  0.500 inches
• Equivalent Focal Length:
  12.237 inches
• Back Focal Length:
  11.879 inches
• Refraction Index:
  1.5110 and 1.6053
• Abbe Constant:
  63.500 and 43.600
• Compound Lens Style:
  Doublet
• Individual Lens Style:
  Double convex and meniscus diverging
• Element Left Surface Radius:
  6.614 inches
• Element Right Surface Radius:
  2.728 inches
• Material:
  Glass, optical, jan-g-174, grade b
• Fsc Application Data:
  Periscope, m20a28 integrated with fire control equipment
• Federal Supply Class (fsc):
  Optical instruments, test equipment, components and accessories
• National Stock Number (nsn):
  6650-00-759-3586