Optical Instrument Lens

Features

Specifications

• Diameter:
  1.890 inches
• Axial Thickness:
  0.326 inches
• Equivalent Focal Length:
  4.084 inches
• Back Focal Length:
  3.889 inches
• Refraction Index:
  1.6110
• Abbe Constant:
  58.800
• Single Lens Style:
  Plano-convex
• Individual Lens Style:
  Plano-convex
• Element Left Surface Radius:
  2.600 inches
• Element Right Surface Radius:
  58.898 millimeters
• 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 periscope m28, integrated with fire control equipment
• Federal Supply Class (fsc):
  Optical instruments, test equipment, components and accessories
• National Stock Number (nsn):
  6650-00-692-1536