Optical Instrument Lens

Features

Specifications

• Diameter:
  20.0 millimeters
• Axial Thickness:
  4.0 millimeters and 3.0 millimeters
• Compound Lensaxial Thickness:
  7.0 millimeters
• Compound Lens Edge Thickness:
  7.0 millimeters
• Equivalent Focal Length:
  198.170 centimeters or 120.870 centimeters
• Back Focal Length:
  196.060 centimeters or 120.680 centimeters
• Refraction Index:
  1.5110 and 1.5838
• Abbe Constant:
  63.500 and 46.000
• Compound Lens Style:
  Doublet
• Individual Lens Style:
  Double convex and plano-concave
• Element Left Surface Radius:
  771.3 millimeters and -705.7 millimeters
• Element Right Surface Radius:
  771.3 millimeters and 0.0 millimeters
• Material:
  Glass, optical, jan-g-174, grade a
• Federal Supply Class (fsc):
  Optical instruments, test equipment, components and accessories
• National Stock Number (nsn):
  6650-00-382-1912