Model #7688718

Optical instrument lens (NSN 6650-00-768-8718)

Special Features
Front and back surfaces coated with magnesium fluoride. All edges chamfered 0.020 in. Min. By 45 deg. Rim and chamfers ground.
Description

type 720-293 grade c class 1 mil-g-174 optical type 511-635 and glass grade c class 1 mil-g-174 optical glass material.

Diameter
Between 1.062 inches and 1.065 inches
Axial Thickness
Between 0.108 inches and 0.128 inches and 0.384 inches and 0.404 inches
Compound Lensaxial Thickness
Between 0.492 inches and 0.532 inches
Compound Lens Edge Thickness
0.469 inches
Equivalent Focal Length
35.620 inches
Refraction Index
1.5110 and 1.7200
Abbe Constant
63.500 and 29.300
Compound Lens Style
Doublet
Individual Lens Style
Double convex and double concave
Element Left Surface Radius
1.575 inches
Element Right Surface Radius
1.087 inches
Material
Glass, optical, mil-g-174, class 1, grade c, type 511-635 and glass, optical, mil-g-174, class 1, grade c, type 720-293
Fsc Application Data
Periscope, tank
Description
Lens,optical Instrument
Cage Code
19200

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Updated: 11/21/2024