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connloyalist
Joined: 22 Jul 2020 Posts: 249 Location: the Netherlands
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Posted: Tue Oct 20, 2020 2:47 pm Post subject: M39 lenses with a "tongue" sticking out the rear |
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connloyalist wrote:
Something just occurred to me and I would like to double check if I am correct.
I sometimes see lenses (for example various Steinheil Culminar 135mm lenses) that have a "tongue" that slightly protrudes from the rear of the lens. Is this a (or, the) rangefinder coupling? And if yes does the presence of such a "tongue" indicate that it is in fact an M39 for Leica and not an M39 lens for Braun Paxette? Is the reverse also true (no tongue = Braun)?
Example picture from eBay:
Regards, C. |
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connloyalist
Joined: 22 Jul 2020 Posts: 249 Location: the Netherlands
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Posted: Tue Oct 20, 2020 2:55 pm Post subject: |
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connloyalist wrote:
Answering my own question: Probably not, because Leitz lenses do not have this "tongue". So the question the n becomes, what is the purpose of this?
Regards, C. |
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kds315*
Joined: 12 Mar 2008 Posts: 16544 Location: Weinheim, Germany
Expire: 2021-03-09
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Posted: Tue Oct 20, 2020 3:13 pm Post subject: |
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kds315* wrote:
Yes, Leitz lenses DO HAVE such, as it transmits the focus information to the camera to adjust the viewfinder. _________________ Klaus - Admin
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DConvert
Joined: 12 Jun 2010 Posts: 902 Location: Essex UK
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Posted: Tue Oct 20, 2020 3:30 pm Post subject: |
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DConvert wrote:
kds315* wrote: |
Yes, Leitz lenses DO HAVE such, as it transmits the focus information to the camera to adjust the viewfinder. |
Perhaps it's only on longer focal lengths. None of my LTM lenses have it, but I don't think I have any longer than 70mm. |
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stevemark
Joined: 29 Apr 2011 Posts: 3754 Location: Switzerland
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Posted: Tue Oct 20, 2020 6:04 pm Post subject: |
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stevemark wrote:
DConvert wrote: |
kds315* wrote: |
Yes, Leitz lenses DO HAVE such, as it transmits the focus information to the camera to adjust the viewfinder. |
Perhaps it's only on longer focal lengths. None of my LTM lenses have it, but I don't think I have any longer than 70mm. |
It in fact depends on the focal length. The mechanism inside the camera is adjusted for normal lenses. Other focal lengths require a "translated" movement on the side of the lens. Sometimes this mechanism looks like a tongue, sometimes not.
S _________________ www.artaphot.ch |
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connloyalist
Joined: 22 Jul 2020 Posts: 249 Location: the Netherlands
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Posted: Tue Oct 20, 2020 6:24 pm Post subject: |
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connloyalist wrote:
So if a lens has a "tongue" then it definitely is a lens designed for a Leica. If it does not have the tongue, it might or might not be. Correct?
Any other way of distinguishing a Leica M39 from a Braun M39 lens by looking at the lens?
Regards, C. |
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Lightshow
Joined: 04 Nov 2011 Posts: 3669 Location: Calgary
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Posted: Tue Oct 20, 2020 6:41 pm Post subject: |
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Lightshow wrote:
The "Tongue" is only on longer focal lengths, 90mm seems to be the transition point, I have a few with and a few without the tongue, shorter lenses seem to use a ring with a helicoid that's driven off the main helicoid/focus ring, and longer lenses seem to all have the tongue, I assume it has to do with the the change in how much the optics have to move for the plane of focus to go from MFD to infinity, longer focal lengths require more movement to cover that range. Beyond 135mm they moved towards Visioflex for a TTL operation.
Edit: Yes, the tongue is an exclusive (to the best of my knowledge) feature of LTM. _________________ A Manual Focus Junky...
One photographers junk lens is an artists favorite tool.
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Last edited by Lightshow on Sat Oct 31, 2020 1:18 pm; edited 1 time in total |
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stevemark
Joined: 29 Apr 2011 Posts: 3754 Location: Switzerland
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Posted: Wed Oct 21, 2020 4:05 pm Post subject: |
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stevemark wrote:
connloyalist wrote: |
So if a lens has a "tongue" then it definitely is a lens designed for a Leica. If it does not have the tongue, it might or might not be. Correct? |
Yes.
connloyalist wrote: |
Any other way of distinguishing a Leica M39 from a Braun M39 lens by looking at the lens?
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Maybe this?
http://forum.mflenses.com/braun-paxette-lenses-list-t80315.html
S _________________ www.artaphot.ch |
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philslizzy
Joined: 07 Aug 2012 Posts: 4748 Location: Cheshire, England
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Posted: Sat Oct 24, 2020 7:53 pm Post subject: |
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philslizzy wrote:
I'm 100% certain that its a LTM version. This lens wasn't made for Braun, only LTM and Exakta to my knowledge. It will have the initials VL on the front
LTM lenses that don't rotate internally when they're focused just use this 'tongue'. many lenses have one. It lines up with the rangefinder coupling. The Brauns use a full circle type of coupling. I doubt one like this would work on Braun.
my 135 lenses with tongues; Hektor Canon and Tanar
_________________ Hero in the 'messin-with-cameras-for-the-hell-of-it department'. Official. |
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yoyomaoz
Joined: 31 Jul 2018 Posts: 89 Location: Adelaide
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Posted: Wed Nov 04, 2020 7:06 am Post subject: |
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yoyomaoz wrote:
If you think about it, it makes sense that only longer focal length lenses should have this "tongue". In these older lenses the helicals and the optical components are at the front of the lens. If the lens is to be rangefinder coupled it is necessary that the position of those lens elements is transmitted to the camera's rangefinder arm. This "tongue" moves in and out as the lens is focused to convey that to the rangefinder. Shorter focal lengths do not require it as there is a rim on the back of the optics which moves the rangefinder arm instead. Just as this "tongue" does. _________________ Peter M
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philslizzy
Joined: 07 Aug 2012 Posts: 4748 Location: Cheshire, England
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Posted: Wed Nov 04, 2020 8:14 pm Post subject: |
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philslizzy wrote:
yoyomaoz wrote: |
If you think about it, it makes sense that only longer focal length lenses should have this "tongue". In these older lenses the helicals and the optical components are at the front of the lens. If the lens is to be rangefinder coupled it is necessary that the position of those lens elements is transmitted to the camera's rangefinder arm. This "tongue" moves in and out as the lens is focused to convey that to the rangefinder. Shorter focal lengths do not require it as there is a rim on the back of the optics which moves the rangefinder arm instead. Just as this "tongue" does. |
Yes, the tongue acts as an extension to the focusing mechanism _________________ Hero in the 'messin-with-cameras-for-the-hell-of-it department'. Official. |
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