Optical Instrument Lens

Features

Specifications

• Diameter:
  39.2 millimeters
• End Application:
  Rangefinder mk57
• Axial Thickness:
  8.2 millimeters and 4.0 millimeters and 4.5 millimeters
• Compound Lensaxial Thickness:
  73.1 millimeters
• Equivalent Focal Length:
  43.090 centimeters or 199.610 centimeters or 35.050 centimeters
• Back Focal Length:
  43.050 centimeters or 199.610 centimeters or 30.630 centimeters
• Front Focal Length:
  42.230 centimeters or 199.810 centimeters or 30.630 centimeters
• Refraction Index:
  1.5170 and 1.8170 and 1.5170
• Abbe Constant:
  64.500 and 36.600 and 64.500
• Compound Lens Style:
  Dialyte
• Individual Lens Style:
  Double convex and meniscus diverging and plano-convex
• Element Left Surface Radius:
  196.1 millimeters and -171.0 millimeters and 1033.0 millimeters
• Element Right Surface Radius:
  171.0 millimeters and 2090.2 millimeters and 0.0 millimeters
• Material:
  Glass, optical, jan-g-174
• Federal Supply Class (fsc):
  Optical instruments, test equipment, components and accessories
• National Stock Number (nsn):
  6650-00-155-1360