8567556

Optical instrument window

8567556 Description

24.9 millimeters width, 4.800 millimeters thickness, 62.740 millimeters length, polished surface finish, corners rounded 0.237in. Max 0.197in. Min. Radius; resolving power to be 30 sec of arc or better as used whenscanning clear aperture with a telescope of at least a 0.5in. Aperture; light deviation not to exceed plus or minus 2 min of arc; spherical power not toexceed 7 millidiopters; astigmatism not to exceed 3 millidiopters; surface quality 80-50 .

Features

Corners rounded 0.237in. Max 0.197in. Min. Radius; resolving power to be 30 sec of arc or better as used whenscanning clear aperture with a telescope of at least a 0.5in. Aperture; light deviation not to exceed plus or minus 2 min of arc; spherical power not toexceed 7 millidiopters; astigmatism not to exceed 3 millidiopters; surface quali type 80-50

Properties of 8567556

Width:
Between 24.9 millimeters and 25.4 millimeters
Thickness:
Between 4.800 millimeters and 5.200 millimeters
Length:
Between 62.740 millimeters and 63.240 millimeters
Surface Finish:
Polished
Bevel Depth:
0.510 millimeters
Refraction Index:
Between 1.5160 and 1.5180
Polished Surface:
Both
Dispersion:
Between 64.000 angstroms and 65.000 angstroms
Reflection Reducing Surface:
Both
Polished Periphery:
Not provided
Bevel Angle In Deg:
45.000
Material:
Glass, optical, jan-g-174, type 517-645, grade c
Material:
Glass, optical, jan-g-174, type 517-645, grade c
Fsc Application Data:
Sight periscope t42
NSN:
1240-00-599-9218
Description:
Window,optical Instrument
Cage Code:
19200

Definition Optical Instrument Window

A color free item of transparent or translucent material, usually optical glass, having specific light dispersive and refractive properties. This item must have two plane-parallel surfaces and is designed for use in an optical instrument to provide a barrier to foreign matter and/or permit light transmission in or to the optical system.

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Last modified 05/03/2024