ViTiny UM20-GN08, Руководство пользователя

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1.6 Microscope Focus
Depends on the object and observation needs, change the
suitable object lens. Take the chart as reference for the
working distance. Recommend to find focus from the
minimum magnification (Zoom out to the end, easier to find
focus). Use Gearbox to quick find the shape of object; once
the shape is seeable, use fine tune to find clear image. When
clear image is found, rotate the lock to fix the focus.
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