In a collection to materials on disassembling of interesting lenses. Who knows, can it be useful?
On this lens the focusing ring sticks. It doesn’t reach installation on infinity and isn’t put in the most close focusing for this lens 1:2.
To remove a metal sleeve, having hooked and having unscrewed for special dimples which it is visible on the picture.
To turn out a stopper ring. In a figure it is shown for what to hook and twist.
Further small cunning. Something like a stopper ring, but two-piece.
Therefore we glue rings an adhesive tape that didn’t collapse after untwisting.
We remove a ring.
After removal of a ring of focusing it becomes clear that it is simply a ring with the put scale of distances, and the real ring which controls a lens block, is interfaced to this fake-ring.
Here we look at elements and we see that the spacer on the screw one fell off which responds for focusing. Perhaps from an old age, and someone can got into a lens.
This metal whetstone in case of rotation adjoins to the delimiter of the course of a focus ring.
And the focusing ring in case of rotation in the opposite direction is fixed.
We examine amount of lubrication. Lubrication shan’t be neither much, nor it isn’t enough. When there is a lot of, it too increases resistance to movement of a focus ring.
Further we turn off one more stopper ring and we take out a lens-block.
If there is too much oil, we clean it. We work with a bayonet joint further.
We put small screws in a back cover of a lens that weren’t lost.
Now we remove a diaphragm ring.
Regulation of completely open diaphragm.