Optical Instrument Lens

Features

Specifications

• Diameter:
  2.520 inches
• Axial Thickness:
  0.551 inches and 0.160 inches
• Compound Lensaxial Thickness:
  0.711 inches
• Compound Lens Edge Thickness:
  0.458 inches
• Equivalent Focal Length:
  7.839 inches
• Back Focal Length:
  7.292 inches
• Front Focal Length:
  6.581 inches
• Refraction Index:
  1.5110 and 1.6210
• Abbe Constant:
  63.500 and 36.200
• Compound Lens Style:
  Doublet
• Individual Lens Style:
  Double convex and plano-concave
• Element Left Surface Radius:
  -3.555 inches and 3.260 inches
• Element Right Surface Radius:
  -3.555 inches and 3.260 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:
  Sight, reflex m18, integrated with fire control equip
• Federal Supply Class (fsc):
  Optical instruments, test equipment, components and accessories
• National Stock Number (nsn):
  6650-00-546-9582