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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.
ITEM
Magnification
Boresight Characteristics:
Accuracy
Retention
Repeatability
System Resolution subject to Tube Resolution:
36 to 44 lp/mm
45 to 54 lp/mm
55 to 64 lp/mm
Over 65 lp/mm
1-6
TABLE 1-1. SYSTEM DATA
Unity (1 X)
Factory aligned to ½ MOA or better
Permanent to within 1 MOA or better
Within ½ MOA
0.38 mrad/lp
0.30 mrad/lp
0.25 mrad/lp
0.21 mrad/lp
DATA
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