TM-9-1240-401-34&P Technical Manual for M109 Telescopes and Mounts Download
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TM 9-1240-401-34&P 5-26. M117/M117A2 PANORAMIC TELESCOPE FINAL INSPECTION AND ADJUSTMENT - continued d. EYEPIECE FOCUS 1 Using dioptometer (1), check reticle focus for the optimum focus of minus 0.5 to minus 1.0 diopter. 2 If adjustment is required, remove four setscrews (2) and rotate M117/M117A2 panoramic telescope eyepiece (3) until optimum focus is achieved. 3 4 Using hand sealing gun, inject sealing compound into holes of two setscrews (2) nearest to counter assembly. Apply sealing compound to threads of four setscrews (2) and install. e. PARALLAX ADJUSTMENT 1 2 3 Sighting through M117/M117A2 panoramic tele- scope eyepiece (1), adjust M117/M117A2 pano- ramic telescope until reticle geometric center (inter- section of cross lines) is on the vertical line of test reticle of the collimating projector (2). Move head from side to side while viewing through M117/M117A2 panoramic telescope eyepiece (1). Parallax (movement between collimating projector (2) reticle and the M117/M117A2 panoramic tele- scope reticle) must not exceed thickness of vertical reticle line (0.1 mil). If parallax is not within specified limits, return M117/M117A2 panoramic telescope to depot main- tenance. 5-52