Optical Instrument Lens

Features

Specifications

• Diameter:
  28.0 millimeters
• End Application:
  Rangefinder mk51
• Axial Thickness:
  5.0 millimeters and 3.0 millimeters
• Compound Lensaxial Thickness:
  8.0 millimeters
• Equivalent Focal Length:
  14.057 centimeters
• Back Focal Length:
  13.705 centimeters
• Front Focal Length:
  13.891 centimeters
• Refraction Index:
  1.5110 and 1.6490
• Abbe Constant:
  63.500 and 33.800
• Compound Lens Style:
  Doublet
• Individual Lens Style:
  Double convex and meniscus diverging
• Element Left Surface Radius:
  99.2 millimeters and -56.9 millimeters
• Element Right Surface Radius:
  56.9 millimeters and 168.1 millimeters
• Material:
  Glass, optical
• Federal Supply Class (fsc):
  Optical instruments, test equipment, components and accessories
• National Stock Number (nsn):
  6650-00-155-2880