Optical Instrument Lens

Features

Specifications

• Diameter:
  31.0 millimeters
• End Application:
  Rangefinder mk42
• Axial Thickness:
  6.0 millimeters and 3.0 millimeters
• Compound Lensaxial Thickness:
  9.0 millimeters
• Equivalent Focal Length:
  19.430 centimeters
• Back Focal Length:
  19.250 centimeters
• Refraction Index:
  1.5055 and 1.5105
• Abbe Constant:
  43.500 and 63.700
• Compound Lens Style:
  Doublet
• Individual Lens Style:
  Double convex and meniscus diverging
• Element Left Surface Radius:
  117.4 millimeters and -45.1 millimeters
• Element Right Surface Radius:
  45.1 millimeters and 306.3 millimeters
• Material:
  Glass, optical, jan-g-174
• Federal Supply Class (fsc):
  Optical instruments, test equipment, components and accessories
• National Stock Number (nsn):
  6650-00-157-4138