[Leica] Leica R lenses on Nikon bodies with the Leitax bayonet

[drodgers at casefarms.com (David Rodgers)]

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 ----- 
From: <wildlightphoto@earthlink.net>
To: "Leica Users Group" <lug@leica-users.org>
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
>
>
>
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