Optical Instrument Lens

Features

Specifications

• Diameter:
  1.575 inches
• Axial Thickness:
  0.484 inches and 0.092 inches
• Compound Lensaxial Thickness:
  0.576 inches
• Compound Lens Edge Thickness:
  0.436 inches
• Equivalent Focal Length:
  3.729 inches
• Back Focal Length:
  3.169 inches
• Refraction Index:
  1.6380 and 1.6490
• Abbe Constant:
  55.500 and 33.800
• Compound Lens Style:
  Doublet
• Individual Lens Style:
  Double convex and double concave
• Element Left Surface Radius:
  1.488 inches
• Element Right Surface Radius:
  1.366 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):
  6650-00-692-1540