MIL-DTL-62420B(AT)
3.4.1.2 Spherical power. Spherical power shall be within the range of minus (-) 0.50 to
plus (+) 0.25 diopter.
3.4.1.3 Astigmatism. Astigmatism shall not exceed 0.25 diopter.
3.4.1.4 Photopic transmission. The photopic transmission of laser protected periscopes,
excluding M1 periscopes, shall be equal to or greater than 36 percent (%). The photopic
transmission of M1 periscopes shall be equal to or greater than the value specified below. The
photopic transmission shall be measured at 0 +2 degrees incidence:
Periscope
Nomenclature
Photopic transmission
12357840
Commander's Side
29%
12357841
Commander's Front
24%
12357846
Driver's Side
33%
12357848
Driver's Front
33%
3.4.1.5 Optical density. The optical density requirements for specific wavelength ranges
shall be as specified in MIL-PRF-62422, or equivalent. The optical density shall be measured at
0 +2 degrees (°) incidence.
3.4.1.6 Angular deviation. With the periscope held on its mounting surface in a
horizontal plane, an incident ray entering normal to the entrance window shall exit the exit
window within +1° of the angle specified on the applicable drawing.
3.4.2 Cleaning spray.
3.4.2.1 Vehicle exterior cleaning spray. The assembly shall meet the performance
requirements of 3.4.1 and shall show no evidence of damage after the portion of the assembly
above the sealing surface is exposed to a water jet or steam spraying a commercial alkali steam
cleaning solution, immediately followed by a cold water rinse.
3.4.2.2 Vehicle interior cleaning spray. The assembly shall meet the performance
requirements of 3.4.1 and shall show no evidence of damage after the portion of the assembly
below the sealing surface is exposed to a jet spray of tap water.
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