TM-9-1290-262-24&P Technical Manual for M2A2 Aiming Circle Download
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ARMY TM 9-1290-262-24&P MARINE CORPS TM 00476C-24&P AIR FORCE TO 49A7-3-72/74 4-4. TEST AND ADJUSTMENT PROCEDURES (cont). PARALLAX OF OBJECTIVE ASSEMBLY 1 2 3 4 5 6 7 Direct aiming circle (1) line-of-sight into collimator (2). Adjust collimator (2) for a distance of 50 yd (46 m). Check parallax between image of collima- tor reticle and aiming circle reticle at the center of field of view. Parallax must not exceed 0.3 roil. Parallax between tele- scope reticle and projector collimator shall be near zero at 50 yd (46 m), and shall not exceed 0.3 mils over a range of 30 to 150 yd (27 to 137 m). Sight through aiming circle eyepiece at normal eye distance. Move your head 1/4 inch from side to side and up and down. If image of collimator reticle appears to move with respect to aiming circle reticle, paral- Iax is present. Amount of parallax is indi- cated against markings on collimator reti- cle. Screw objective assembly (3) in or out as required. Repeat step 4. If parallax cannot be eliminated, replace objective assembly. Repeat steps 4 and 5 until parallax is eliminated. Spot seal edge of objective assembly to telescope body in two places with sealing compound (item 8, appx D). 4-24