Optical Instrument Lens

Features

Specifications

• Diameter:
  Between 0.557 inches and 0.560 inches
• Axial Thickness:
  Between 0.108 inches and 0.128 inches
• Equivalent Focal Length:
  3.176 inches
• Back Focal Length:
  3.098 inches
• Refraction Index:
  1.5230
• Abbe Constant:
  58.600
• Single Lens Style:
  Plano-convex
• Element Left Surface Radius:
  1.661 inches
• Material:
  Glass, optical, mil-g-174, class 1, grade b, type 523-586
• Fsc Application Data:
  Trainer, tank gunnery
• Federal Supply Class (fsc):
  Optical instruments, test equipment, components and accessories
• National Stock Number (nsn):
  6650-00-251-7512
• Special Features:
  Edges beveled 0.005 to 0.010 in. By 45 deg. Rim and beveled edges ground.