Optical Instrument Lens

Features

Specifications

• Diameter:
  Between 2.518 inches and 2.520 inches
• Axial Thickness:
  0.768 inches and 0.177 inches
• Compound Lensaxial Thickness:
  0.945 inches
• Compound Lens Edge Thickness:
  0.614 inches
• Equivalent Focal Length:
  9.229 inches
• Back Focal Length:
  8.061 inches
• Front Focal Length:
  9.736 inches
• Refraction Index:
  1.5170 and 1.7200
• Abbe Constant:
  64.500 and 29.300
• Compound Lens Style:
  Doublet
• Individual Lens Style:
  Double convex and double concave
• Element Left Surface Radius:
  -2.559 inches and 2.559 inches
• Element Right Surface Radius:
  -2.559 inches and 28.346 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:
  1. Fire control computing sights and devices
• Federal Supply Class (fsc):
  Optical instruments, test equipment, components and accessories
• National Stock Number (nsn):
  6650-00-816-0507