Optical Instrument Lens

Features

Specifications

• Diameter:
  1.220 inches
• Axial Thickness:
  0.3662 inches and 0.0866 inches
• Compound Lensaxial Thickness:
  Between 0.429 inches and 0.469 inches
• Compound Lens Edge Thickness:
  0.281 inches
• Equivalent Focal Length:
  2.603 inches
• Back Focal Length:
  2.491 inches
• Refraction Index:
  1.5170 and 1.6490
• Abbe Constant:
  64.500 and 33.800
• Compound Lens Style:
  Doublet
• Individual Lens Style:
  Double convex and meniscus diverging
• Element Left Surface Radius:
  1.9405 inches and -1.1957 inches
• Element Right Surface Radius:
  -1.1957 inches and -2.7240 inches
• Material:
  Glass, optical, mil-g-174, class 1, grade c
• Material Specification:
  Mil-g-174, class 1, grade c military specification single material response
• Fsc Application Data:
  Sight periscope m25, integrated with fire control equipment
• Federal Supply Class (fsc):
  Optical instruments, test equipment, components and accessories
• National Stock Number (nsn):
  6650-00-346-8211