Model #7688774

Optical instrument lens (NSN 6650-00-768-8774)

Special Features
Edges chamfered 0.010 to 0.020 in. By 45 deg. Both surfaces coated with magnesium fluoride. Rim ground.
Description

type 617-550 grade d class 1 mil-g-174 optical glass material.

Diameter
Between 1.297 inches and 1.300 inches
Axial Thickness
Between 0.200 inches and 0.220 inches
Equivalent Focal Length
3.859 inches
Back Focal Length
3.759 inches
Refraction Index
1.6170
Abbe Constant
55.000
Single Lens Style
Double convex
Element Left Surface Radius
3.100 inches
Element Right Surface Radius
10.000 millimeters
Material
Glass, optical, mil-g-174, class 1, grade d, type 617-550
Fsc Application Data
Periscope, tank
Description
Lens,optical Instrument
Cage Code
19200

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Updated: 11/21/2024