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what is accoplished by turning the coarse adjustment upward and downward

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100percentcorrectviz
When you turn the coarse adjustment upward the body tube with the objectives raise , when you turn the coarse adjustment downward the body tube with the objectives lowers. And its focuses the object to be observed.
adjusting the coarse adjustment upward makes the view wider and downward makes it closer to your spesemen

DID YOU KNOW ABOUT THE FINE ADJUSTMENT KNOB??