中央调焦轮
/ˈsɛntɹəl ˈfəʊkəsɪŋ ˈwiːl/
n
English: central focusing wheel · 中央调焦轮
English · central focusing wheelEspañol · rueda central de enfoqueFrançais · molette de mise au point
释义：Focusing ring for both the objective lenses; it is used to manually adjust the sharpness of the image.