Specifications

MIL-STD-1472E
5,11 .3.7.2 Davli~ht. For daylight application the exit pupil diameter should not be less than 3
mm (O.12 in).
5.11.3.7.3 Lowli~ht levels. Formwimizing ptiomau attwilight mdlower light levels, the
exit pupil should be not less than 7 mm (0.28 in).
5.11.3.8 EYerelief. Along eyerelief, e.g. 25m(lin), should kprovidd forveticul~
mounted sights if the observer must be protwted from gun recoil, observe on the move, or maintain
some field-of-view while wearing a protective mask. To permit use by observers wearing glasses
when recoil is not encountered, eye relief shall beat not less than 155 mm (0.6 in).
5.11 .3.9 Eyepiece adjustments.
5.11 .3.9.1 4-Power and less. Fixed focus eyepieces set between -0.50 and -1.00 diopter may
be used for instruments 4-power and less.
5.11 .3.9.2 0ver4-po
wer. Eyepiece ciioprnc (focusing) adjustments (4 to +2 diopt.m required,
-6 to +2 diopters desired) shall be provided and marked in 0.5 diopter increments on all instruments
over 4-power magnification.
5.11.3.10 OP
tical quality.
5.11 .3.10.1 Axial resolution. Axial resolution shall be equal to or better than 300 rnrad (1 rein)
divided by the magnification to provide an eye-limited instrument.
5.11 .3.10.2 Luminous transmission. Luminous transmission should be as high as possible,
preferably greater than 50%.
5.11.3.11 Retitles.
5.11 .3.11.1 Line thickness. Reticle lines shall be thin enough so as not to obscure targets, but
thick enough to be easily seen. Reticle lines should subtend not less than 600 mrad (2 rein) at the eye.
5.11 .3.11.2 Patterns. Reticle patterns should be as simple as possible and restrictd to one main
mission (e.g., major weapon ballistic scales) per reticle glass. Additional patterns should be on
separate reticle glasses if added complexity is warranted for the particular application.
5.11 .3.11.3 Format. Line retitles should be used in preference to retitles containing one, two,
or three central spots, A small cross or very small circle should be used in preference to a dot.
5.11.3. ! 1.4 Paralktx. The reticle should be focused to the target range of primary interest to
limit the paralhtx to an acceptable value throughout the usable range.
5.11.3.12 Illuminated sights and retitles.
5.11 .3.12.1 Night operations. illuminated retitles shall be provided for sights to be used during
twilight or night operations.
5.11 .3.12.2 Color. BIUCshall not be used as the color ot dh.mmatmn for renclcs or sights.
s ] ] 7 I~ ~ ~lmnlil~~. sight l~lminance sha]] he Continuoltsly adiustnhlc until it is extinguished.
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