LEICA ELMARIT-M 24mm f/2.8 ASPH. 鏡片起霧清潔、對焦環重新潤滑 Lens glasses and focusing-ring CLA

這支 Leica M 24/2.8 ASPH. 內鏡片起霧需要清理，對焦環稍緊，鏡主希望能重新潤滑。
這算是一般的基礎保養，在此做個紀錄。

This Leica M 24/2.8 ASPH. has fog inside the lens glasses need to clean. The owner said the focusing-ring works a little bit tight and want me re-lubricate the helicoid to make it turns smoother.
This is a basic maintenance and post a record here.