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TM 9-258
crossline of the instrument. Now, remove the mask and
9-7. Determination of Curvature of Image.
place the cutout circle on the center of the objective.
Sharply focus the instrument on a point in the center of
Examine the image of the object. Any blurring of the
the image and note whether or not the points at the edge
image may be attributed to unfocused rays in the outer
of the image are clear and well defined. If the edges of
zones of the objective. Adjust whatever focusing devices
the image are hazy, continue focusing the instrument
there are available to sharply focus the image.  The
until the edges of the image are sharp and distinct. The
amount of movement required is an indication of the
amount of focusing required is an indication of the
amount of spherical aberration present.
curvature of image.
9-2

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