observing an area during darkness (Figure 2-27). The sniper normally carries the goggles, because the observer has the M16 mounted with the nightsight. The goggles make it easier to see due to their design. However, the same limitations that apply to the nightsight also apply to the goggles.
c. Night Vision Goggles, AN/PVS-7 Series. The night vision goggles, AN/PVS-7 series (Figure 2-28, page 2-36) has a better resolution and viewing ability than the AN/PVS-5 goggles. The AN/PVS-7 series goggles have a'nead-mount assembly that allows them to be mounted in front of the face so that both hands can be free. The goggles can be used without the mount assembly for hand-held viewing. (See TM 11-5855-262-10-1.)
d. Laser Observation Set AN/GVS-5. Depending on the mission, snipers can use the AN/GVS-5 to determine the range to the target. The AN/GVS-5 (LR) (Figure 2-29, page 2-36) is an individually operated, hand-held, distance-measuring device designed for distances from 200 to 9,990 meters (with an error of plus or minus 10 meters). It measures distances by firing an infrared beam at a target and by measuring the time the reflected beam takes to return to the operator. It then displays the target distance, in meters, inside the viewer. The reticle pattern in the viewer is graduated in 10-mil increments and has display lights to indicate low battery and multiple target hits. If the beam hits more than one target, the display gives a reading of the closest target hit. The beam that is fired from the set poses a safety hazard; therefore, snipers planning to use this equipment should be thoroughly trained in its safe operation. (See TM 11-5860-201-10.)
e. Mini-Eyesafe Laser Infrared Observation Set, AN/PVS-6. The AN/PVS-6 (Figure 2-30) contains the following components: mini-eyesafe laser range finder; batteries, BA-6516/U, nonrechargeable, lithium thionyl chloride; carrying case; shipping case; tripod; lens cleaning compound and lens cleaning tissue; and operator's manual. The laser range finder is the major component of the AN/PVS-6. It is lightweight, individually operated, and hand-held or tripod mounted; it can accurately determine ranges from 50 to 9,995 meters in 5-meter increments and displays the range in the eyepiece. It can also be mounted with and bore-sighted to the night observation device, AN/TAS-6, infrared observation set, long-range.
2-14. M49 OBSERVATION TELESCOPE The M49 observation telescope is a prismatic optical instrument of 20-power magnification (Figure 2-31, page 2-38). The telescope is focused by turning the eyepiece in or out until the image of the object being viewed is crisp and clear to the viewer. The sniper team carries the telescope on all missions. The observer uses the telescope to determine wind speed and direction by reading mirage, observing the bullet trace, and observing the bullet impact. The sniper uses this information to make quick and accurate adjustments for wind conditions. The lens are coated with a hard film of magnesium fluoride for maximum light transmission. Its high magnification makes observation, target detection, and target identification possible where conditions and range would otherwise preclude this ability. Camouflaged targets and those in deep shadows can be more readily distinguished. The team can observe troop movements at greater distances and identify selective targets with ease.
a. Components. Components of the telescope include a removable eyepiece and objective lens covers, an M15 tripod with canvas carrier, and a hard ease carrier for the telescope.
b. Storage. When storing the M49 observation telescope, the sniper must remove it from the hard case earner and remove the lens caps to prevent moisture from gathering on the inside of the scope. Maintenance consists of—
(1) Wiping dirt and foreign materials from the scope tube, hard case carrier, and M15 tripod with a damp rag.
(2) Cleaning the M49 lens with lens cleaning solution and lens tissue only.
(3) Brushing dirt and foreign agents from the M15 carrying case with a stiff-bristled brush; cleaning the threading of lens caps on the M49 and the tripod elevation adjustment screw on the M15 with a toothbrush, then applying a thin coat of grease and moving the lens caps and elevation adjustment screw back and forth to evenly coat threading.
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