Archived posting to the Leica Users Group, 2009/01/19
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Thanks, David. I hope you can find a way to salvage the 28. Jim Nichols Tullahoma, TN USA ----- Original Message ----- Sent: Monday, January 19, 2009 8:56 AM Subject: RE: [Leica] Leica R lenses on Nikon bodies with the Leitax bayonet > Jim, > > Sorry I didn't reply sooner. I'm having some problems with my mail > server and I'm missing some messages. > > Even if an adapter or camera doesn't touch the diaphragm lever, the > lever is still important to the operation of the lens. It's part of the > linkage between the aperture ring that you turn on the lens, and the > lens diaphragm itself. > > Doug explained things better than I could. It's difficult to describe > how the inner and outer aperture rings interact, but pretty apparent if > you look inside the lens. > > On the first lens I converted everything worked fine and the lenses > operates like a Takumar in set to "M". On the second lens the diaphragm > arm rubbed against the bayonet. The friction kept the aperture from > opening and closing smoothly. This was on a conversion to F mount. I'm > not at all familiar with how the Oly adapter operates. > > DaveR > > > > -----Original Message----- > From: Jim Nichols [mailto:jhnichols@lighttube.net] > Sent: Monday, January 19, 2009 12:56 AM > To: Leica Users Group > Subject: Re: [Leica] Leica R lenses on Nikon bodies with the Leitax > bayonet > > Doug, > > My question to David was not really about his lens. He is aware that I > am > about to receive a similar lens which I plan to use, with an appropriate > > adapter, on my Oly E-510. I assumed that, with no contact between the > body > mechanism and the piece that David broke, the lens would stop down to > the > setting called for by the aperture ring. In other words, I assumed the > lens > would operate similar to a Takumar when set to "M". If this is not > correct, > I could be in trouble with my plans to use the lens on the Oly. > > Jim Nichols > Tullahoma, TN USA > ----- Original Message ----- > > Sent: Sunday, January 18, 2009 11:45 PM > Subject: Re: [Leica] Leica R lenses on Nikon bodies with the Leitax > bayonet > > >> Jim Nichols wrote: >> >>>If I install the 28 on an adapter which has no mechanism to contact > the >>>lens >>>part that broke, will the aperture ring still operate the aperture > leaves? >> >> Depends on how much broke off. The aperture ring is directly > connected to >> the inner aperture ring, (the thing that stops the arm) and in all of > the >> lenses I've worked on it's immediately inboard of the aperture ring. >> Break off enough of the arm and it will miss the stop and close to > minimum >> aperture or smaller, no matter what the aperture ring is set to. >> >> The arm is part of the inner aperture ring assembly which as a new >> replacement part was $300 a number of years ago. >> >> Doug Herr >> Birdman of Sacramento >> http://www.wildlightphoto.com >> >> >> >> _______________________________________________ >> Leica Users Group. >> See http://leica-users.org/mailman/listinfo/lug for more information >> >> > > > > > > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information > >