Keith: Glad that helped - doing the research also clarified my own memories! The spring-loaded pin is the one that is depressed from the camera body to close the aperture down for exposure. Interestingly enough, I have two examples of the 50/1.4, one labelled "Super-Takumar" and one "SMC Takumar". The former has no aperture-transmission mechanism nor machined stop on the mount, while the latter has both.
John Coyle Brisbane, Australia On Friday, September 13, 2002 3:56 AM, Keith Whaley [SMTP:[EMAIL PROTECTED]] wrote: > Thanks, John. > > It all helps. Now I'm faced with selling a couple of my stop-down > aperture lenses and replacing with full-aperture metering lenses. I > bought a couple when I was 'unaware.' <g> > I really hate getting rid of my Super Takumar 135mm f/3.5 M-42 mount. > It's so smooth and small, and almost brand new! If there's an SMC > Takumar version of the same lens, that has the aperture lever, either > M-42 or K-mount I'll buy it! <SNIP> > > One question left...there's a _tiny_ spring loaded pin on the rear > _mounting_ face of my M-42 lenses. It's located about 1/4" CCW from > the solid machined stop on the aperture ring on the rear, but the pin > itself is on the mounting face. > What is it? > > Keith Whaley
