Asahi Super-Multi-Coated Takumar 200mm F4 aperture disassembly.

Removal of the aperture assembly from a Asahi Optical Co. Super-Multi-Coated Takumar 200mm F4 lens (m42) for cleaning or replacing. The aperture would not stop down on this lens. Here is the easy way to remedy it. Music by Masaya Kuzume.