要完整解決上述問題，就必須要將整支鏡頭完全拆解才能達成
此鏡結構複雜，拆解過程需要耗費許多精力，重新組裝時，也必須要做適當的校正，才能讓鏡頭表現保持原本的水準
The lens came in a bad condition, the internal glasses had many dirts and oily haze, the focus/zoom ring turned un-smoothly. In order to resolve these problems, a full disassembling is unavoidable.
The structure of this lens is quite complex and took much time and energy to take apart the lens for cleaning and re-lubrication. During the assembling process, a proper calibration is needed to keep the lens' performance the same as its original.
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