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Voigtlānder Nokton 35mm f 1.4
Old 06-01-2011   #1
BTE 48
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Smile Voigtlānder Nokton 35mm f 1.4

My beloved Voigt Länder Nokton 35mm f1, 4 have become very loose, can anyone pleas tell about how it can be tightened up, workshop manual or exploded drawings.

BTE
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Old 06-07-2011   #2
monopix
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What's actually loose? Focus ring, mount, front group etc.??
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Old 06-07-2011   #3
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The main span ring is hidden behind the back element. First you have to untwist the back element (1) by hand, then you tighten (2), the span ring.



Roland.
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Old 06-09-2011   #4
BTE 48
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Thanks for your response, I have uploaded a video here which describes how this is perceived. https://www.facebook.com/pages/Voigt...3273483?ref=ts
Do you need to dismantle the lens from the front or from the bayonet?

Many thanks
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Old 06-09-2011   #5
ferider
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From the back. Leave the bayonet mount alone. Like I said above, first unscrew (1) by hand, then (2) with a spanner.
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Old 06-09-2011   #6
BTE 48
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you say with hand, is this very hard screwed together ?
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Old 06-09-2011   #7
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No. You have to grab the two baffles sticking out. Just be careful not to bend them.
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Old 07-07-2011   #8
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Many thanks for your help, the problem is now solved
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Old 07-07-2011   #9
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All hail to how cool RFF is. Enjoyed following this.
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Old 10-02-2011   #10
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ferider, could you please explain how to disassemble the outside part of the lens?
My problem is that the aperture ring become loose, it slides back and forth in the direction parallel to the lens axis. To get access to it I removed four screws from the back side of the lens mount, then removed the mount and the black ring (one with the red dot on it), but could not take avay the next part - the ring with a distance scale on it (((
Many thanks in advance.
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Old 10-03-2011   #11
ferider
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Quote:
Originally Posted by antver
concerning this post: http://www.rangefinderforum.com/foru...d.php?t=106636
could you please explain how to disassemble the outside part of the lens?
my problem is that the aperture ring become loose, it slides back and forth in the direction parallel to the lens axis. I tried to fix it - I removed four screws from the back side of the lens mount, then removed the mount and the black ring (one with the red dot on it), but could not take avay the next part - one with distance scale on it (((
Sorry for my English,
and thank you in advance.
Anton
Hi Anton,

the aperture is attached to the main optical barrel. I don't know how to tighten it, but I recommend to take off the optics from the focus mount, and then look.

To take the optics out, you have to take the rear element off first ((1) with your fingers, untwist), then loosen the span ring (2) with a wrench.

I would then get to the aperture via the screws color'ed in green below. But not sure, this I haven't done myself.

Roland.

Last edited by ferider : 10-03-2011 at 05:47.
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Old 10-04-2011   #12
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Roland, thank you.

I have removed parts denoted (1)-(5) on the picture below; what I need now is to remove part (7) - but it is still somehow fixed from inside.

I can see no screws or nuts fixing it; I can move it to the back end of the lens - but not more than 3-4 mm, as it shown on the picture.

And my final goal is to get access to the thing which keeps the aperture ring (6) in its place. May be you have suggestions?

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Old 10-04-2011   #13
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Hi Anton,

almost there, be patient. I think 7 is twisted in a way that prevents 6 from sliding out. Twist it back and forth, or even better, put 4+5 back to make 7 go back into the right position - 6 will just pull out then.

Roland.
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Old 01-03-2013   #14
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sorry for digging up such a old thread,

but i am facing very similar problem with my lens...

wondering anyone documented the steps to open as well as putting back the lens?
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Old 07-08-2015   #15
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I have a similar problem.

I recently bought a 35mm Nokton with a stiff focus. I've read that this problem is fairly common, so I decided to open it up to have a look. Well, I didn't get very far (my spanner is way too thick to remove the rear optics) so decided to close the lens up for the time being.

Of course, given my luck, I am now unable to screw the M-mount back onto the rest of the lens. Is there some sort of trick to screwing these parts back together that I'm just not seeing?

I have looked on RFF, Youtube, and have even asked Rabbi Google for words of wisdom, but have come up a bit short. The only repair step-by step that I even found was a dead link to the old cosina-voigtlander fan site.

Anyone have experience with this? A stiff focus is better than a lens in pieces.

Thanks!
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Old 07-10-2015   #16
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Incidentally, due to a lack of responses, I reached out to a local repair person, who refused to work on this lens, stating that he only works on Leica, Hasselblad, and Rollei cameras/lenses.

According to him, Cosina-Voigtlander have their own set of specialized tools that only work on their products, much like Leica.

While I am inclined to, you know, not believe that at all, it still leaves me with a lens in pieces. Any ideas?
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Old 07-10-2015   #17
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1) regarding the mount, you have to keep trying patiently - there is no trick to it.

2) to adjust the lens focus, you don't need to take the mount off. You need to remove the rear element first (twist counter clockwise, by holding the two visible baffles with your fingers). Once the rear element is off, you can take the optical block out of the focus mount with a normal spanner. You will then see 4 screws (locked with paint) that can be used for focus adjustment. If they are tightened unevenly, this will lead to stiff focus. You can also adjust the RF cam to your liking (if you want to optimize at a specific aperture, for instance).

Roland.
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Old 07-10-2015   #18
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Roland-- Thanks for the reply,

I'm not particularly impatient, and I certainly don't want to be forceful, so it's been difficult getting the mount back together. I just didn't know if I was approaching re-attachment the wrong way.

Regarding adjustment, I realized that after I removed the mount. I also do not have the right size spanner wrench atm, so will need to find one before I can make the necessary adjustments.

Quote:
Originally Posted by ferider View Post
1) regarding the mount, you have to keep trying patiently - there is no trick to it.

2) to adjust the lens focus, you don't need to take the mount off. You need to remove the rear element first (twist counter clockwise, by holding the two visible baffles with your fingers). Once the rear element is off, you can take the optical block out of the focus mount with a normal spanner. You will then see 4 screws (locked with paint) that can be used for focus adjustment. If they are tightened unevenly, this will lead to stiff focus. You can also adjust the RF cam to your liking (if you want to optimize at a specific aperture, for instance).

Roland.
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Old 07-10-2015   #19
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I have put mounts together on several 35 and 40 Noktons, Leth, and it has driven me nuts sometimes. After trying for half an hour or so, it usually works though. The brass helixes (?spell) fit very tightly together which makes the mount hard to put together unless mount and helix are not perfectly parallel.

Roland.
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