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Is mounted on MIL-STD-1913 rail or dayscope lens.
Is submersible to 10 m for 30 minutes.
Filled with dry nitrogen to prevent internal fogging.
D. System Limitations
The PS28 is an effective night vision system designed for night op-
erations but does have the following limitations:
The sight requires some night light (moonlight, starlight, etc.) to
operate. Night light is reduced by such factors as passing cloud
cover and objects that produce shadows.
The sight is less effective viewing through rain, fog, sleet, snow,
smoke.
Under starlight conditions low contrast environments (such as
snowcovered territory, sandy deserts, large bodies of water or
grassy hills) degrade visibility thereby disguising or masking
changes in terrain.
Under low-light conditions the sight looses some of the resolu-
tion that it has under full moon.
TABLE 1-1. SYSTEM DATA
ITEM DATA
Magnification Unity (1 X)
Boresight Characteristics:
Accuracy Factory aligned to ½ MOA or better
Retention Permanent to within 1 MOA or better
Repeatability Within ½ MOA
System Resolution subject to Tube Resolution:
36 to 44 lp/mm 0.38 mrad/lp
45 to 54 lp/mm 0.30 mrad/lp
55 to 64 lp/mm 0.25 mrad/lp
Over 65 lp/mm 0.21 mrad/lp
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