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Collimation  chanqe
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Telescope, Panoramic: M137 and M137A1
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Five mil click lead mechanism



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MIL-T-48554A(AR)
3.10.3 Reticle  accuracy. The angular separation between the
40 mil graduations on the horizontal axis shall be 80 mils 0.5 roil.
3.10.4 Resolution. The resolution on the optical axis shall
be 15 seconds of arc or less when using an observation telescope
of at least 3 power and entrance pupil of at least 0.4 inches.
Resolution consists of detectable line structure and proper line
count in all four meridians. Total spread in focus shift between
meridians shall not exceed 0.25 diopter as measured at the
eyepiece.
3.10.5 Parallelism of reticle and image. The vertical
reticle line shall be parallel to the image of a vertical target
line and shall not exceed 30 minutes of arc at the position
established in paragraph 3.7.
3.10.6 Image  tilt. The image of a vertical target line
shall be vertical and shall not exceed one degree of arc
throughout two (2) revolutions of the head. This requirement
shall also be met with the elbow assembly positioned against each
of the swing stops.
3.10.7 Reticle  cut-off. All reticle graduations, including
the "80" numerals shall be visible throughout two (2) complete
revolutions of the Head. This requirement shall be met with the
eyepiece elbow assembly positioned against each of the swing
stops .
3.11 Performance.
3.11.1 Elevation
mechanism.
3.11.1.1 Excursion  range. Rotation of the elevation knob
shall cause the line of sight to elevate and depress a minimum of
300 mils from the position specified in 3.7.
3.11.1.2 Plumb  travel. Starting with the line of sight in
coincidence with a vertical target line at zero elevation, the
line of sight shall track the target line within 0.5 mil when
elevated 300 mils depressed to 300 mils depression, then elevated
to zero elevation.
3.11.2 Azimuth
mechanism.
3.11.2.1 800 mil steps. Error at deflection or bearing
readings in 800 mil steps throughout two full revolutions of the
head in one direction shall not exceed 1.0 mil including backlash.
The total spread between the greatest positive error and the
greatest negative error shall not exceed 1.0 roil, including
backlash. The total error, excluding backlash, between the 6400
mil upper azimuth counter reading and the deflection or bearing
6

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