Optical Instrument Lens

Features

Specifications

• Diameter:
  27.0 millimeters
• End Application:
  Rangefinder mk42
• Axial Thickness:
  8.5 millimeters and 2.0 millimeters
• Compound Lensaxial Thickness:
  10.5 millimeters
• Equivalent Focal Length:
  4.715 centimeters
• Back Focal Length:
  4.033 centimeters
• Refraction Index:
  1.6490 and 1.5725
• Abbe Constant:
  33.800 and 57.400
• Compound Lens Style:
  Doublet
• Individual Lens Style:
  Double convex and meniscus diverging
• Element Left Surface Radius:
  25.6 millimeters and -23.9 millimeters
• Element Right Surface Radius:
  23.9 millimeters and 345.5 millimeters
• Material:
  Glass, optical, jan-g-174
• Federal Supply Class (fsc):
  Optical instruments, test equipment, components and accessories
• National Stock Number (nsn):
  6650-00-157-4140