LEICA VARIO-ELMAR-R 80-200mm f/4.0
鏡頭摔落地，使對焦螺紋變形，導致對焦環轉動不易。
拆鏡後，將對焦螺紋打磨，解決對焦環轉動不易的問題。
The focusing ring turned quite unsmoothly because the lens fell down that made the focusing thread distortion.
The way to solve this problem was to polish the thread.
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