Leica Leitz Summicron 5cm f/2.0 Collapsible 縮頭五 對焦環對焦組件重新潤滑 Lubricating the focusing helicoids, focusing parts

Leica Summicron 5cm f/2.0 Collapsible 縮頭五 對焦環轉動不順 重新潤滑
這鏡頭對焦組件的結構看似簡單，但是拆解組裝是有一點複雜與費時

The focusing ring did not work smoothly so I made a lubrication.
The structure of this lens focusing assembly looks simple, but the disassembly and assembly is a bit complicated and time-consuming.