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Stiff focus ring Carl Zeiss Jena Sonnar MC 135mm, f3.5
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PostPosted: Fri Jan 17, 2020 12:54 pm    Post subject: Stiff focus ring Carl Zeiss Jena Sonnar MC 135mm, f3.5 Reply with quote

Hi

I have searched the forum and cannot find an answer ..

The focus ring on the Carl Zeiss Jena Sonnar MC 135mm, f3.5 will not rotate from about 12 feet to infinity . I was sure it did in the shop when I bought it. It turns smoothly and then abruptly stops . 

I've trawled the internet looking for tips on how to fix the issue , but the one link I found was no longer valid.

I am excited about using the lens as it has great reviews .


Can anybody assist me

Many thanks


PostPosted: Sat Jan 18, 2020 9:28 pm    Post subject: Reply with quote

I'll see if I can find any info for you.

In the mean time, don't take it apart unless you do a lot of research and preparation. Focusing helicoids are generally very easy to disassemble, but very difficult to get back together properly unless you know how to mark them. It's not hard, but it can be tricky for a novice.

If no one responds here, you can also try YouTube. There are a lot of lens repair videos there.


PostPosted: Sun Jan 19, 2020 5:02 pm    Post subject: Reply with quote

KEO wrote:
I'll see if I can find any info for you.

In the mean time, don't take it apart unless you do a lot of research and preparation. Focusing helicoids are generally very easy to disassemble, but very difficult to get back together properly unless you know how to mark them. It's not hard, but it can be tricky for a novice.

If no one responds here, you can also try YouTube. There are a lot of lens repair videos there.


Thanks for the advice . I was going to just "have a go" , but will hold back 😀


PostPosted: Mon Jan 20, 2020 9:22 pm    Post subject: Reply with quote

bwfcnottingham wrote:
Thanks for the advice . I was going to just "have a go" , but will hold back 😀


The main problem is that there are multiple different threads on the focusing helicoid, and only one pairing or mating is the right one. There may be four, five, or even more ways to put the helicoid back together, and all of them will fit perfectly and seem correct, but only one way is the right way. If you do it the wrong way you'll lose infinity focus.

Before you separate the threads you have to set the focus to infinity and mark the metal so you can see where the threads are correctly aligned and whether the two parts of the helicoid are screwed together the correct amount. To put it another way, they must be screwed together the correct number of turns. To put it still another way, it's not enough to align them correctly in one dimension; they must be aligned correctly in two dimensions.

That might sound complicated, but it's really not that difficult. As long as you mark the parts of the helicoid before you take them apart, you can always just keep screwing them together until you hit the right thread combination. It can also help a lot to mark the helicoids just before you separate them the first time, so you can see the proper position to introduce the threads.

However, some lenses are more difficult than others. I don't know about the CZJ Sonnar 135 MC, but some of the older CZJ lenses are very tricky.


PostPosted: Tue Jan 21, 2020 1:35 am    Post subject: Reply with quote

KEO wrote:
bwfcnottingham wrote:
Thanks for the advice . I was going to just "have a go" , but will hold back 😀


The main problem is that there are multiple different threads on the focusing helicoid, and only one pairing or mating is the right one. There may be four, five, or even more ways to put the helicoid back together, and all of them will fit perfectly and seem correct, but only one way is the right way. If you do it the wrong way you'll lose infinity focus.

Before you separate the threads you have to set the focus to infinity and mark the metal so you can see where the threads are correctly aligned and whether the two parts of the helicoid are screwed together the correct amount. To put it another way, they must be screwed together the correct number of turns. To put it still another way, it's not enough to align them correctly in one dimension; they must be aligned correctly in two dimensions.

That might sound complicated, but it's really not that difficult. As long as you mark the parts of the helicoid before you take them apart, you can always just keep screwing them together until you hit the right thread combination. It can also help a lot to mark the helicoids just before you separate them the first time, so you can see the proper position to introduce the threads.

However, some lenses are more difficult than others. I don't know about the CZJ Sonnar 135 MC, but some of the older CZJ lenses are very tricky.


One major issue is I cannot turn the lens to infinity as it gets stuck around 7 feet .

Thanks for the detailed response, much appreciated for sure


PostPosted: Tue Jan 21, 2020 1:51 am    Post subject: Reply with quote

https://www.pinterest.com/pin/612982199264811051/


PostPosted: Tue Jan 21, 2020 1:07 pm    Post subject: Reply with quote

I had one of these with a loose focus sleeve. It was an easy fix IIRC. You can start by unscrewing the top end - hood + nameplate - and having a look. Just grip and unscrew.


PostPosted: Thu Jan 23, 2020 11:50 pm    Post subject: Reply with quote

marcusBMG wrote:
I had one of these with a loose focus sleeve. It was an easy fix IIRC. You can start by unscrewing the top end - hood + nameplate - and having a look. Just grip and unscrew.


Thanks for your help and advice Marcus Smile


PostPosted: Thu Jan 23, 2020 11:52 pm    Post subject: Reply with quote

visualopsins wrote:
https://www.pinterest.com/pin/612982199264811051/


Thank you , Pinterest , does'lt let me logon , How strange ....


PostPosted: Sat Jan 25, 2020 8:35 pm    Post subject: Reply with quote

visualopsins wrote:
https://www.pinterest.com/pin/612982199264811051/


Nice link. I had no idea Pinterest had so much lens repair content.


PostPosted: Sat Jan 25, 2020 9:55 pm    Post subject: Reply with quote

bwfcnottingham wrote:
visualopsins wrote:
https://www.pinterest.com/pin/612982199264811051/


Thank you , Pinterest , does'lt let me logon , How strange ....


Strange. For me no logon required. Don't have an account. Maybe your location has restrictions?


PostPosted: Mon Jan 27, 2020 12:12 pm    Post subject: Reply with quote

visualopsins wrote:
bwfcnottingham wrote:
visualopsins wrote:
https://www.pinterest.com/pin/612982199264811051/


Thank you , Pinterest , does'lt let me logon , How strange ....


Strange. For me no logon required. Don't have an account. Maybe your location has restrictions?


I've logged onto Pinterest via my desktop rather than smart phone. When I click on the link in the Pinterest photo it says the website has moved and I am forbidden to access it 😀

I think I might just go for it and have a little faff around with the lens ... cheers everyone 😀📷📸


PostPosted: Mon Jan 27, 2020 8:30 pm    Post subject: Reply with quote

Video: https://www.youtube.com/watch?v=HynLP228VoU
Post: http://www.wiratama.net/camera/carl-zeiss-jena-13535-mc-aperture-cleaning
The tutorials I ever followed.


PostPosted: Mon Jan 27, 2020 9:03 pm    Post subject: Reply with quote

mareinke wrote:
Video: https://www.youtube.com/watch?v=HynLP228VoU
Post: http://www.wiratama.net/camera/carl-zeiss-jena-13535-mc-aperture-cleaning
The tutorials I ever followed.


Thanks for the link , he talks about the blades , so I am hoping I can get to the helicoid following his dismantle instructions 😀😀📷 I will try it later in the week


PostPosted: Mon Jan 27, 2020 10:03 pm    Post subject: Reply with quote

bwfcnottingham wrote:
mareinke wrote:
Video: https://www.youtube.com/watch?v=HynLP228VoU
Post: http://www.wiratama.net/camera/carl-zeiss-jena-13535-mc-aperture-cleaning
The tutorials I ever followed.


Thanks for the link , he talks about the blades , so I am hoping I can get to the helicoid following his dismantle instructions 😀😀📷 I will try it later in the week


check that post, it explains how to reach the helicoid.

Step1:
remove the 2 rods(B), and then unscrew the end casing.


Step2:


Good luck.


PostPosted: Wed Feb 12, 2020 6:09 pm    Post subject: Reply with quote

mareinke wrote:
bwfcnottingham wrote:
mareinke wrote:
Video: https://www.youtube.com/watch?v=HynLP228VoU
Post: http://www.wiratama.net/camera/carl-zeiss-jena-13535-mc-aperture-cleaning
The tutorials I ever followed.


Thanks for the link , he talks about the blades , so I am hoping I can get to the helicoid following his dismantle instructions 😀😀📷 I will try it later in the week


check that post, it explains how to reach the helicoid.

Step1:
remove the 2 rods(B), and then unscrew the end casing.


Step2:


Good luck.


mareinke

Thanks for this .

I followed the diagrams and video . Dismantling was easy . Getting to the helicoid and greasing was easy . Reassembly was ok too, but then I saw the issue. When you twiddle the focus ring , the helicoid travels back and hits the base of the lens ie it cannot get to infinity

It's as if the helicoid spirals are not big enough or the screws holding the base are not long enough .

So the focus ring was never stiff it just won't travel back far enough .

Oh in think I might have broken the little bit that makes the pin retract in and out 🙁


PostPosted: Thu Feb 13, 2020 9:07 pm    Post subject: Reply with quote

bwfcnottingham wrote:
It's as if the helicoid spirals are not big enough or the screws holding the base are not long enough .

So the focus ring was never stiff it just won't travel back far enough


Sounds like you might not be the first person to open up the lens. It's possible someone else put it back together incorrectly.


PostPosted: Mon Feb 17, 2020 7:44 am    Post subject: Reply with quote

[quote="bwfcnottingham"][quote="mareinke"][quote="bwfcnottingham"]
mareinke wrote:
Video: https://www.youtube.com/watch?v=HynLP228VoU
mareinke

Thanks for this .

I followed the diagrams and video . Dismantling was easy . Getting to the helicoid and greasing was easy . Reassembly was ok too, but then I saw the issue. When you twiddle the focus ring , the helicoid travels back and hits the base of the lens ie it cannot get to infinity

It's as if the helicoid spirals are not big enough or the screws holding the base are not long enough .

So the focus ring was never stiff it just won't travel back far enough .

Oh in think I might have broken the little bit that makes the pin retract in and out 🙁


Hi bwfcnottingham,
Like 1 small That was a great start.
People usually add a few witness marks that tells the infinity position.
Part B can be put back in more than one way, but only one entrypoint is correct.
in order to fix this problem, you can redo the whole process with different entry points, adjust it by latest offset, and keep trying until 'lens element travel back normally.'




PostPosted: Thu Feb 20, 2020 8:55 pm    Post subject: Reply with quote

mareinke wrote:


Hi bwfcnottingham,
Like 1 small That was a great start.
People usually add a few witness marks that tells the infinity position.
Part B can be put back in more than one way, but only one entrypoint is correct.
in order to fix this problem, you can redo the whole process with different entry points, adjust it by latest offset, and keep trying until 'lens element travel back normally.'




I have assembled the lens so the focus ring now travels back to infinity ...but with snapping the bit that controls the aperture I am stuck with an aperture of f3.5

I will put it down to experience , it was my first attempt at dismantling . I must be more patient and walk away if struggling rather than forcing the parts !!! If I had walked away and returned again I might have been successful . It was only £15 and I have other 135mm lenses in my collection!

Thanks for your guidance