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There are two knobs. The "coarse focus" knob changes the focal length very quickly, so you use that to get a close to sharp image. Then, you use the "fine focus" knob to perfect the image. Both knobs do the same thing, just at different rates.

Resource: http://shs.westport.k12.ct.us/mjvl/Biology/microscope/microscope.htm

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Q: What is the name of the control knob used for sharp focusing a compound microscope?
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