CANON FE 70-200mm f/2.8 L IS USM 鏡片油霧清潔 cleaning the oil drops on the glasses

這個案例是 CANON FE 70-200mm f/2.8 L IS USM 的對焦鏡組上有幾片鏡片積了許多油霧需要清理。這問題應該是潤滑油脂的油脂分離所致，較稀薄的油四處亂竄後積在鏡片上所形成的問題。
裝載積了油霧的鏡片的鏡筒壁上也都是稀薄的油。 這些地方不該出現的油必須一律清除乾淨，避免後患！

This case shows that there are many tiny oil drops on the glasses of the focusing lens group of this CANON FE 70-200mm f/2.8 L IS USM and much oil on its lens holder and tubes. It is necessary to have a full cleaning.