| Author | Message | ||
     Mareklew Tinkerer Username: Mareklew Post Number: 201 Registered: 03-2010 Rating: N/A |
Mike, this is a different lens than what I have taken apart. However, most are built on similar principle: you take the mount off, there is some provision for preventing the center block from rotating when focusing - either a long screw, or a pin, or... You take that off and screw the optical block out of its focusing helix - preferably noting the angle at which it came out (helix is multi-threaded and you can mount it at an offset which will throw the focusing way off). The optical block can usually be taken apart into main lens groups that are in front and behind the aperture. In some lenses (i.e. Jupiter 8) the optical block sits in an outer tubus and first that tubus meshes with focusing helical. You can take the optics out without disassembling focusing. In the first variant, the manufacturing tollerances are often adjusted at the focusing ring (the infinity stop and scale are moved). In the second case the optical block is shimmed. Marek |