Optical Instrument Lens

Features

Specifications

• Diameter:
  Between 1.391 inches and 1.397 inches
• Axial Thickness:
  Between 0.108 inches and 0.128 inches and 0.384 inches and 0.404 inches
• Compound Lensaxial Thickness:
  Between 0.492 inches and 0.532 inches
• Equivalent Focal Length:
  96.940 inches
• Refraction Index:
  1.5110 and 1.7200
• Abbe Constant:
  63.500 and 29.300
• Compound Lens Style:
  Doublet
• Individual Lens Style:
  Double convex and double concave
• Element Left Surface Radius:
  1.3400 inches
• Element Right Surface Radius:
  2.4390 inches
• Material:
  Glass, optical, mil-g-174, class 1, grade c, type 511-635 and glass, optical, mil-g-174, class 1, grade c, type 720-293
• Fsc Application Data:
  Periscope, tank
• Federal Supply Class (fsc):
  Optical instruments, test equipment, components and accessories
• National Stock Number (nsn):
  6650-00-768-8725
• Special Features:
  Chamfer edges 0.020 in. Min, 0.030 in. Max. By 45 deg. Front and back surfaces coated with magnesium fluoride.