ANGENIEUX-ZOOM 45-90mm f/2.8 鏡片清潔 變質鏡片拋光處理 Glass Cleaning, Polishing treatment to deteriorated surface

ANGENIEUX鏡頭常有的問題，就是鏡片會變質起霧，這支45-90/2.8也不例外。

還沒有拆鏡之前，鏡片看起來髒髒霧霧的，想說可能有好幾個面需要拋光處理，拆鏡之後，發現幸好只有一個面有變質需要拋光，其他大都只是髒污或薄霧等可以直接清理乾淨。

需要拋光處理的鏡片看起來相當的霧，這是玻璃本身很淺層的變質，不過經過精確的拋光處理，變質層被拋除，鏡片恢復乾淨清透，畫質依舊保持犀利！

The glasses of this ANGENIEUX 45-90/2.8 looks dirty and foggy that need a cleaning. After disassembling the lens and inspect all the glasses, I found that there is one surface of front internal glass got a deterioration problem that make it looks hazy. The polishing treatment is the only way to make it clean and clear again without altering its original optical performance.