Optical Instrument Lens

Features

Specifications

• Diameter:
  1.749 inches
• Axial Thickness:
  0.414 inches and 0.178 inches
• Compound Lensaxial Thickness:
  0.592 inches
• Compound Lens Edge Thickness:
  0.474 inches
• Equivalent Focal Length:
  7.500 inches
• Back Focal Length:
  7.214 inches
• Front Focal Length:
  6.622 inches
• Refraction Index:
  1.5230 and 1.6490
• Abbe Constant:
  58.600 and 33.800
• Compound Lens Style:
  Doublet
• Individual Lens Style:
  Double convex and meniscus diverging
• Element Left Surface Radius:
  -3.337 inches and 4.723 inches
• Element Right Surface Radius:
  -10.542 inches and -3.337 inches
• Material:
  Glass, optical, mil-g-174, class 1, grade b
• Fsc Application Data:
  Periscope integrated with fire control equip
• Federal Supply Class (fsc):
  Optical instruments, test equipment, components and accessories
• National Stock Number (nsn):
  6650-00-758-0292