Optical Instrument Lens

Features

Specifications

• Diameter:
  Between 3.527 inches and 3.530 inches
• Axial Thickness:
  Between 0.199 inches and 0.209 inches
• Equivalent Focal Length:
  -5.963 inches
• Back Focal Length:
  -6.026 inches
• Refraction Index:
  1.6130
• Abbe Constant:
  44.300
• Single Lens Style:
  Double concave
• Element Left Surface Radius:
  -7.353 inches and 7.353 inches
• Material:
  Glass, optical, mil-g-174, grade b
• Federal Supply Class (fsc):
  Optical instruments, test equipment, components and accessories
• National Stock Number (nsn):
  6650-00-393-0318