Turn the lens over and remove the rear
lens cap.
If you remove the four screws on the
lens mount, the lens mount will come off
as a unit.
The red arrow mark shows that plastic
parts have been incorporated with the
diaphragm cam. From this era, it has
been moved to the diaphragm ring and
directly attached. A revolutionary
structural change.
Note! When the aperture ring is lifted,
it will come off, but at this time the
spring of the click stop will bounce
and the tiny bearing will tend to go
missing.
Remove the three screws and remove
the lens unit.
