Model #7688725

Optical instrument lens (NSN 6650-00-768-8725)

Special Features
Chamfer edges 0.020 in. Min, 0.030 in. Max. By 45 deg. Front and back surfaces coated with magnesium fluoride.
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 1.391 inches and 1.397 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
Equivalent Focal Length
96.940 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
1.3400 inches
Element Right Surface Radius
2.4390 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: 11/24/2024