Optical Instrument Lens

Features

Specifications

• Diameter:
  Between 2.204 inches and 2.205 inches
• Axial Thickness:
  0.866 inches and 0.157 inches
• Compound Lensaxial Thickness:
  1.024 inches
• Compound Lens Edge Thickness:
  0.619 inches
• Equivalent Focal Length:
  3.952 inches
• Back Focal Length:
  4.090 inches
• Front Focal Length:
  3.170 inches
• Refraction Index:
  1.5170 and 1.6210
• Abbe Constant:
  64.500 and 36.200
• Compound Lens Style:
  Doublet
• Individual Lens Style:
  Double convex and plano-concave
• Element Left Surface Radius:
  -1.705 inches and 1.705 inches
• Element Right Surface Radius:
  -1.705 inches
• Material:
  Glass, optical, mil-g-174, class 1, grade c
• Material Specification:
  Mil-g-174, class 1, grade c military specification single material response
• Fsc Application Data:
  Fire control computing sights and devices
• Federal Supply Class (fsc):
  Optical instruments, test equipment, components and accessories
• National Stock Number (nsn):
  6650-00-152-7974