Optical Instrument Lens

Features

Specifications

• Diameter:
  0.984 inches
• Axial Thickness:
  0.121 inches and 0.210 inches
• Compound Lensaxial Thickness:
  0.331 inches
• Compound Lens Edge Thickness:
  0.306 inches
• Equivalent Focal Length:
  4.739 inches
• Front Focal Length:
  4.628 inches
• Refraction Index:
  Between 1.6110 and 1.6490
• Abbe Constant:
  33.800 and 58.800
• Compound Lens Style:
  Doublet
• Individual Lens Style:
  Double convex
• Element Left Surface Radius:
  5.3640 inches
• Element Right Surface Radius:
  1.0420 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 periscope m28, integrated with fire control equipment
• Federal Supply Class (fsc):
  Optical instruments, test equipment, components and accessories
• National Stock Number (nsn):
  6650-00-692-1532