to focus
焦距调节效果 CW Super Rack Focus
焦距调节 FOCUS LENTH CONTROL ; focal length setting
他的眼睛累了，调节焦距困难。
His eyes were so tired that he had difficulty focusing them.
youdao
双筒望远镜是用一个旋钮调节焦距的。
What is the range of this telescope?
计算越精确就有如调节焦距般的效果：图像更清晰。
More accurate calculations would have the same effect as focusing a lens: the picture becomes sharper.
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