I took apart the S-M-C Takumar 200mm f/4 today because I noticed the “Auto and Manual” switch wasn’t opening the aperture blades when set to “Auto” mode. The procedure is pretty easy considering I never took a part a lens before and had no instructions.
This is how I disassembled the S-M-C Takumar 200mm f/4. You’ll need those mini screw drivers, both – and +.
1) I set the lens to minimum focus, this will fully extend the lens. If you don’t do this first, you can’t access the screws.
2) Remove the screws on the focus ring and depth of field scale.
3) You should now see a “big screw” that was under the depth of field scale. Unscrew it then remove the screws on the aperture ring. Be careful not to lose the ball bearing when you slide the aperture ring out. The ball bearing is what makes the aperture ring “click.”
4) Now you should be able to see three larger screws that hold the glass elements piece and the mount piece of the lens together. I didn’t need to disassemble the glass elements so I left it aside. From this point on it should be pretty self-explanatory how to take the mount piece apart, if you need to.
5) Putting it back together is exactly the opposite. Just remember to put the ball bearing back and to line up f/4 on the aperture ring to the “big screw” mentioned in step three.
There are more pictures on Flickr.
