The small pin you are talking about is for defeating the A/M lever when mounted on a "F" or "ES" bodies.
Bob Rapp ----- Original Message ----- From: "John Coyle" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Friday, September 13, 2002 5:25 PM Subject: RE: SMC F 70-210 Vs. Takumar F 70-210 > Sorry Keith, I've never seen one of those! And I misinterpreted it's > position - now I look at your post again it's much too far from where > the aperture pin is. > > Can't help with that one, I'm afraid. > > John Coyle > Brisbane, Australia > > > On Friday, September 13, 2002 2:23 PM, Keith Whaley > [SMTP:[EMAIL PROTECTED]] wrote: > > > > > > John Coyle wrote: > > > > > > The spring-loaded pin is the one that is depressed from the camera > > > body to close the aperture down for exposure. > > > > No, it isn't. The aperture pin is at least 1/16" diameter and sticks > > out at least 1/8" or more.. This pin I'm talking about is only about > > .010" diameter and only sticks out from the rear face of the lens > > body > > maybe .040" or less! Maybe 1/6 the diameter of the aperture pin! Half > > of the Pentax owners don't even know it's there, most likely! > > Only occurs on M-42 lenses. >
