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MIL-T-45688D(MU)
4.6.8.3 Parallax.- Parallax at the optical axis (geometric center of
reticle) shall not exceed the tolerance specified in 3.8.3 while viewing
a target positioned at 200, 400 and 1600 meters. Parallax is recognized
as any apparent movement of vertical and horizontal reticle lines with
respect to the target image when the observer's head is moved from side
to side or up and down.
4.6.8.4 Parallelism of reticle and image.- The "HEAT-T" reticle patt-
ern of the telescope shall be positioned in the field of view for this
test.  Position one extremity of the vertical reticle line coincident to
the vertical target line image.  The reticle line shall be parallel to
the vertical target line image within the tolerance specified in 3.8.4,
as measured on the target at the opposite extremity of the reticle line.
Retain the reticle pattern in the field of view for subsequent test.
4.6.8.5 Reticle wander.- Perform this test with the aid of the auxi-
liary telescope specified in 4.5.2.3.2.3. Affix the auxiliary telescope
to the eyepiece of the telescope under test. Articulate the telescope
eyepiece housing assembly to the position specified in 3.8.1.c. Center
the reticle pattern of the auxiliary telescope on the image of the reticle
boresight cross in the telescope under test. Elevate and depress the
eyepiece housing of the telescope as required in 3.8.5 while observing
the image of the reticle boresight cross at the eyepiece of the auxiliary
telescope. During this articulation of the eyepiece housing the image of
the reticle boresight cross shall not deviate in excess of the tolerance
specified in 3.8.5, as measured by the reticle of the auxiliary telescope.
4.6.8.6 Reticle lean.- The test shall be performed with the aid of
the auxiliary telescope positioned as specified in 4.6.8.5. Adjust the
auxiliary telescope vertical line coincident to the image of the vertical
reticle line of the telescope under test. Elevate  depress the tet-
scope eyepiece housing as specified in 3.8.6. The image of the articulat-
ed telescope's vertical reticle line shall remain parallel to the auxiliary
telescope's vertical reticle line within the tolerance specified in 3.8.6
during this articulation. Reticle lean shall be measured on tje auxiliary
telescope reticle with reference to the telescope's vertical reticle line.
4.6.8.7 Image tilt.- Perform this test with the aid of an auxiliary
telescope specified in 4.5.2.3.2.3. Articulate the telesope eyepice
housing assembly to the position specified in 3.8.1(c). Plumb the ver-
tical reticle line of the auxiliary telescope and position the telescope
at the eyepiece of articulated telescope.  Observe through the auxiliary
telescope and establish one extremity of the telescope vertical reticle
line coincident to the vertical target line image. The target line image
shall be parallel to the auxiliary telescope vertical. reticle line within
the tolerance specified in 3.8.7, as measured on the target.
4.6.9 Resolution.- Perform this test utilizing an auxiliary telescope
with a magnification of at least 3 power (3X), and a resolving power chart
on a wall target. The resolving power chart shall represent the angular
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