CANON EF 300mm f/4.0 L IS 脫膠處理 起霧油霧處理 Separation treatment, cleaning oily haze & fog

這支Canon 300/4 L IS鏡片看起來霧矇矇的，拆鏡後發現有鏡片是一般起霧、有鏡片是積了油霧，還有在防手震組有一組膠合鏡片脫膠了

一般的起霧和油霧可以直接清理乾淨，而脫膠的鏡組只要按照脫膠處理程序慢慢處理了，就能恢復原本通透的狀態

最後，鏡頭是恢復無霧的乾淨狀態

This Canon 300/4 L IS looks hazy. After disassembling the lens, I found that the hazy problem on different glasses, one has normal fog, one has oily haze. The most serious problem is the cemented lens group separation happened to the IS group.

Normal fog and oily haze can be cleaned directly. Following the separation treatment procedure, the lens group with balsam issue can be restored back to its original clear condition.