FED Industar-26M maintenance and CLA

In disassembly, that this is a lens, that its older counterparts such as Industar-61 and Industar-61 L / D are almost the same. Disassembly for full service starts at the bottom and ends at the top. However, if only the helicoid needs to be serviced, there are three ways: https://liveviewer.ru/2022/04/industa...