Optical Instrument Lens

Features

Specifications

• Diameter:
  51.0 millimeters
• End Application:
  Rangefinder mk51
• Axial Thickness:
  9.4 millimeters and 5.3 millimeters
• Compound Lensaxial Thickness:
  19.1 millimeters
• Equivalent Focal Length:
  44.580 centimeters
• Back Focal Length:
  48.720 centimeters
• Front Focal Length:
  48.070 centimeters
• Refraction Index:
  1.9170 and 1.9170
• Abbe Constant:
  64.500 and 36.600
• Compound Lens Style:
  Dialyte
• Individual Lens Style:
  Double convex and meniscus diverging
• Element Left Surface Radius:
  241.4 millimeters and -155.5 millimeters
• Element Right Surface Radius:
  159.9 millimeters and 906.3 millimeters
• Material:
  Glass
• Federal Supply Class (fsc):
  Optical instruments, test equipment, components and accessories
• National Stock Number (nsn):
  6650-00-155-1749