Optical Instrument Lens

Features

Specifications

• Diameter:
  Between 2.198 inches and 2.200 inches
• Axial Thickness:
  Between 0.591 inches and 0.601 inches
• Equivalent Focal Length:
  2.442 inches
• Back Focal Length:
  2.044 inches
• Single Lens Style:
  Meniscus converging
• Material:
  Glass, optical, mil-g-174, grade a and glass, optical, mil-g-174, grade b
• Federal Supply Class (fsc):
  Optical instruments, test equipment, components and accessories
• National Stock Number (nsn):
  6650-01-202-0595
• Special Features:
  Lens no. 7, biocular eyepiece; matl: optical glass (lafn2) per mil-g-174, type 744-448, grade a/b, stain 4, fine anneal (802199-44); r1, 1.5609 radius of lens outside (left) surface; r2, 9.079 radius of lens inside (right) surface; 0.050 dist between base and inside axis; used in biocular assembly on comm and gun disp