OPTO-EDU A63.7080, Instruction Manual

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3. astigmatism adjust method: Adjust the magnification to 3000-5000x, select a
feature point with ROI selection, and set the scanning speed to 64; (unlike the
alignment of final aperture, the scanning speed here is slow) Focus the image to the
clearest, then adjust astigmatism. Drag the slider to see the image change.
Astigmatism regulation standard is, when the image is the clearest, astigmatism
regulation is the most appropriate
Click "stigmator" button to make astigmatism adjustment function effective;
Adjustment mode: click the slider with the left mouse button to make adjustments.
Click once to display green for fine tuning; Click twice for coarse tone, the display is
red;