Optical Instrument Lens

Features

Specifications

• Diameter:
  2.204 inches
• Axial Thickness:
  0.157 inches and 0.866 inches and 0.866 inches
• Compound Lensaxial Thickness:
  1.023 inches
• Compound Lens Edge Thickness:
  0.590 inches
• Equivalent Focal Length:
  3.952 inches
• Back Focal Length:
  4.089 inches
• Front Focal Length:
  3.170 inches
• Refraction Index:
  1.6210 and 1.5170
• Abbe Constant:
  36.200 and 64.500
• Compound Lens Style:
  Doublet
• Individual Lens Style:
  Double convex and plano-concave
• Element Left Surface Radius:
  -5.139 inches and 6.693 inches
• Element Right Surface Radius:
  -1.704 inches and 1.704 inches
• Material:
  Glass, optical, jan-g-174, grade c
• Fsc Application Data:
  Gunsight mk 15 mod 2
• Federal Supply Class (fsc):
  Optical instruments, test equipment, components and accessories
• National Stock Number (nsn):
  6650-00-157-9403