Optical Instrument Lens

Features

Specifications

• Diameter:
  Between 4.075 inches and 4.078 inches
• Axial Thickness:
  0.204 inches and 0.685 inches
• Compound Lensaxial Thickness:
  Between 0.879 inches and 0.899 inches
• Equivalent Focal Length:
  12.224 inches
• Back Focal Length:
  11.627 inches or 11.707 inches
• Refraction Index:
  1.6130 and 1.6070
• Abbe Constant:
  44.300 and 56.700
• Compound Lens Style:
  Doublet
• Individual Lens Style:
  Double convex and plano-concave
• Element Left Surface Radius:
  7.353 inches
• Element Right Surface Radius:
  7.353 inches
• Material:
  Glass, optical, mil-g-174, grade b
• Federal Supply Class (fsc):
  Optical instruments, test equipment, components and accessories
• National Stock Number (nsn):
  6650-00-393-0281