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
Description
grade b mil-g-174 optical grade a and glass mil-g-174 optical glass material.
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