LEICA Tele-Elmarit 90mm f/2.8 對焦環轉動不順重新潤滑 Lubricating the stiff focusing ring focusing helicoids

基礎維護保養
這支 LEICA Tele-Elmarit 90mm f/2.8 對焦環轉動不順，拆解清潔內鏡筒以及對焦螺紋後，上新的潤滑油脂重新潤滑

Besic Maintenance/CLA
This LEICA Tele-Elmarit 90mm f/2.8 focusing ring did not work smooth. Disassembling the lens, cleaning the internal tubes and focusing helicoids, then applying new grease to bring the focusing ring back to best working condition.