Optical Instrument Lens

Features

Specifications

• Diameter:
  2.047 inches
• Axial Thickness:
  0.358 inches and 0.260 inches
• Compound Lensaxial Thickness:
  0.619 inches
• Compound Lens Edge Thickness:
  0.438 inches
• Equivalent Focal Length:
  13.004 inches
• Back Focal Length:
  12.597 inches
• Front Focal Length:
  12.159 inches
• Refraction Index:
  1.5170 and 1.6170
• Abbe Constant:
  64.500 and 36.600
• Compound Lens Style:
  Doublet
• Individual Lens Style:
  Double convex and meniscus diverging
• Element Left Surface Radius:
  6.051 inches and -6.086 inches
• Element Right Surface Radius:
  -6.173 inches and -68.563 inches
• Material:
  Glass, optical, mil-g-174, class 1, grade b
• Fsc Application Data:
  Telescope, model m49
• Federal Supply Class (fsc):
  Optical instruments, test equipment, components and accessories
• National Stock Number (nsn):
  6650-00-520-4662