diameter field of view. The angular separation between particles
shall be greater than 15 mils Particles smaller than 1/4 reticle
line width shall be ignored regardless of distribution.
components. The telescope shall show no
evidence of moisture, grease, fingerprints, condensates,
fractures, or adhesive separation of any glass component.
3.10.1 Parallax. Parallax at the center of the field
not exceed 0.25 mil when viewing targets between 125 meters
3.10.2 Reticle accuracy. The angular separation
0 mil and 60 mil graduations shall be 60 0.5 mils
3.10.3 Resolution. The resolution of the optical axis shall
be 5 seconds of arc or less when using an observation telescope of
at least 3 power and an 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 1/2 diopter as measured at the
3.10.4 Parallelism of reticle and image. This requirement
shall be met with the telescope oriented as specified in 3.6. The
Telescope 20 mil horizontal line shall be parallel to the image of
a target horizontal line and shall not exceed 30 minutes of arc.
3.10.5 Image tilt. This requirement shall be met with
orientation of 3.6 established. The image of a horizontal line
shall be horizontal and shall not exceed one degree of arc.
3.11.1 Collimation of reticle. The boresight graduation
cross shall coincide with a target 20 mils above the horizontal
(Para 3.6) within 1.0 mil. The azimuth of the boresight cross
shall coincide with the plane defined by surfaces "X" and "Y" on
Drawing 11741626 within 1.0 mil.
3.12.1 Torque. The running torque required to operate the
diopter adjustment shall be within the values specified for
standard ambient temperature of +60 to +90F (+16 to +32C), and
shall not exceed the values at the Operating Temperatures
specified in 3.7.2.