Optical Instrument Lens

Features

Specifications

• Diameter:
  83.0 millimeters
• End Application:
  Rangefinder mk45
• Axial Thickness:
  9.0 millimeters and 20.0 millimeters
• Compound Lensaxial Thickness:
  41.0 millimeters
• Compound Lens Edge Thickness:
  Between 5.0 millimeters and 6.0 millimeters
• Equivalent Focal Length:
  76.230 centimeters
• Back Focal Length:
  71.680 centimeters
• Refraction Index:
  1.6170 and 1.5170
• Abbe Constant:
  36.600 and 64.500
• Compound Lens Style:
  Dialyte
• Individual Lens Style:
  Meniscus diverging and double convex
• Element Left Surface Radius:
  1251.5 millimeters and 261.9 millimeters
• Element Right Surface Radius:
  -247.2 millimeters and 408.4 millimeters
• Material:
  Glass, optical, jan-g-174
• Federal Supply Class (fsc):
  Optical instruments, test equipment, components and accessories
• National Stock Number (nsn):
  6650-00-131-0660