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If there are any image distortions:
a
Compare the stigmator values shown at the bottom of the screen with
inserted 4QBSD and retracted 4QBSD.
If the stigmator values vary widely between
retracted and inserted state or exceed 30%:
a
Readjust the position of the 4QBSD with
the adjustment knobs.
Now, the 4QBSD is adjusted.