Topic: Howto: Carl Zeiss Jena Tessar 50mm f2.8 servicing

I've posted a step by step guide on how to service that lens. I'm fairly certain it could be used with similarly designed Carl Zeiss Jena too, like the other Tessars.

http://oomz.net/tessar/

Canon 5DII and a few lens -- Tachihara 8x10. Chamonix 45N-1, Crown Graphic 4x5. Moskva, Zeiss Super Ikonta C
Bronica S2A, Agfa Super Isolette, Iskra, Rolleiflex. Leica M2, Bessa R, Zorki 1,3,3M and a few more...

Re: Howto: Carl Zeiss Jena Tessar 50mm f2.8 servicing

I wonder what crime you had to commit to get sentenced to working in an east german zeiss servicing center. I nearly broke my wrist getting the front cover off and am having huge problems even getting a grip on the front element. grrr....

Leica and Zeiss on Canon DSLR's. My Gallery.

Re: Howto: Carl Zeiss Jena Tessar 50mm f2.8 servicing

Use blue tak ! big_smile works wonder !

Canon 5DII and a few lens -- Tachihara 8x10. Chamonix 45N-1, Crown Graphic 4x5. Moskva, Zeiss Super Ikonta C
Bronica S2A, Agfa Super Isolette, Iskra, Rolleiflex. Leica M2, Bessa R, Zorki 1,3,3M and a few more...

Re: Howto: Carl Zeiss Jena Tessar 50mm f2.8 servicing

I decided that a heightened state of frustration was not a good way to continue so I soaked the whole thread area in WD40 and left it overnight. I'll continue again later!

Leica and Zeiss on Canon DSLR's. My Gallery.

Re: Howto: Carl Zeiss Jena Tessar 50mm f2.8 servicing

Thanks buze!  I have the exact lens with aperture problems (seem like I don't have much luck with CZJs, first thing that goes with these lenses is the aperture).  I might be able to rescue the lens with your instructions.  Much appreciate your time documenting the steps.

Canon 10D with 35mm F1.4L, 50mm F1.4, 100mm F2.0, 135mm F2L, Sigma 180mm F3.5, CZJ 200mm F2.8, 80mm F1.8, Pentacon 29mm F2.8, 30mm F3.5, CZ 50mm F1.7, Leica Elmarit-R 90mm F2.8, Summicron 50mm F2.0

Re: Howto: Carl Zeiss Jena Tessar 50mm f2.8 servicing

I've always shy'd away from these lenses. Since it's only f2. I've come to find out that if I want f2 then I need a 1.4. All lenses seems to be soft wide open, except the ones I can't afford of course.  wink

350D with kit lens, 70-200L IS
Sigma 18-125, 24-70EX
Tak: 55/1.8, 135/3.5, Jupiter9, Vivitar 135/2.8

Re: Howto: Carl Zeiss Jena Tessar 50mm f2.8 servicing

Bah, a tessar is

Canon 5DII and a few lens -- Tachihara 8x10. Chamonix 45N-1, Crown Graphic 4x5. Moskva, Zeiss Super Ikonta C
Bronica S2A, Agfa Super Isolette, Iskra, Rolleiflex. Leica M2, Bessa R, Zorki 1,3,3M and a few more...

Re: Howto: Carl Zeiss Jena Tessar 50mm f2.8 servicing

For some reason, men like to fix thing even though what's broken is probably worthless smile  In my case, at least I attempt to fix things but usually make it worse.

Last edited by GummieBear (2005-10-12 20:36:46)

Canon 10D with 35mm F1.4L, 50mm F1.4, 100mm F2.0, 135mm F2L, Sigma 180mm F3.5, CZJ 200mm F2.8, 80mm F1.8, Pentacon 29mm F2.8, 30mm F3.5, CZ 50mm F1.7, Leica Elmarit-R 90mm F2.8, Summicron 50mm F2.0

Re: Howto: Carl Zeiss Jena Tessar 50mm f2.8 servicing

Well, it's worth a lot more when you have fixed it ! big_smile I think it's a fun occupation to try to figure out how the heck the thing work big_smile

Canon 5DII and a few lens -- Tachihara 8x10. Chamonix 45N-1, Crown Graphic 4x5. Moskva, Zeiss Super Ikonta C
Bronica S2A, Agfa Super Isolette, Iskra, Rolleiflex. Leica M2, Bessa R, Zorki 1,3,3M and a few more...

Re: Howto: Carl Zeiss Jena Tessar 50mm f2.8 servicing

Good, good job Buze...
I'm really impressed !
That's teachin '...

Re: Howto: Carl Zeiss Jena Tessar 50mm f2.8 servicing

Thanks guys ! I took plenty of pics from other "sessions" when I took apart this or that lens (I'm quite proficient now !) but I've not put them into proper tutorials so far, bad bad lazy buze big_smile

Canon 5DII and a few lens -- Tachihara 8x10. Chamonix 45N-1, Crown Graphic 4x5. Moskva, Zeiss Super Ikonta C
Bronica S2A, Agfa Super Isolette, Iskra, Rolleiflex. Leica M2, Bessa R, Zorki 1,3,3M and a few more...

Re: Howto: Carl Zeiss Jena Tessar 50mm f2.8 servicing

Thank you, Buze!
My attempt to overhaul a Pancolar was way less challenging thanks to your howto.
You should have posted a warning though - achieving correct focus to infinity when putting the pieces bak together can drive you crazy! :-)

Sparq

PS: I really love the glare on your iris ;-)

Re: Howto: Carl Zeiss Jena Tessar 50mm f2.8 servicing

Hi Buze! First of all, un grand merci! If only the net had tuturials for all lenses (or at least lens families), it would be great!

I just got a much older brother of your lens (according to the serial number) from ebay. It was advertised as having a stuck diaphragm, and your tutorial had convinced me that this would be a fun thing to solve - and of course the lens cost near to nothing.

Some notes, some problems specific to my little lens.

- You might change the order of two things in your tutorial: the warning about removing the little ball [3] and the instruction to remove [2].
- Note that the spring under ball [3] may actually be loose as well... and it's black, so it's easy to lose. In my case the little spring came out, and I put it aside together with the ball.

- Next, I found the problem with my lens, see picture:

    http://esperanto.homeip.net/Sjoerd/tessar/2006_20D_0824-ete.jpg

Not the diaphragm was stuck! In fact, it was working perfectly and smoothly! But somebody put a lot of glue (see arrow) between the aperture setting ring [4] and the focusing barrel [5]. So, I had to clean away the glue. I used quite some force - noting that the area around the glue was already very scratched. See result below.

    http://esperanto.homeip.net/Sjoerd/tessar/2006_20D_0825-ete.jpg

Now, the part of aperture ring [4] where the glue was, is supposed to interact with the part of the focusing barrel [5] shown in the following picture, in order to create the click-stops of the diaphragm.

    http://esperanto.homeip.net/Sjoerd/tessar/2006_20D_0826-ete.jpg

Actually, it doesn't! I think there should be a little spring and ball in the hole that was filled with glue. How is that in your lens Buze? You did not mention it - am I mistaken about the ball that should be there? Does your aperture ring "click" into the stops somehow?

Anyway, I put it back together, and the aperture ring is turning again, more smoothly than ever (too smooth...). There seems to be some small problem with the focusing barrel - I think it is not perfectly round anymore. But after reassembly and some fresh grease it is in good shape again!

    http://esperanto.homeip.net/Sjoerd/tessar/2006_20D_0828-ete.jpg

    http://esperanto.homeip.net/Sjoerd/tessar/2006_20D_0829-ete.jpg

Time for my little Tessar to return the favour to his friend who documented the work wink

    http://esperanto.homeip.net/Sjoerd/tessar/2006_20D_0830-ete.jpg
     Tessar 2.8/50 @ f16 on Canon 20D, 8s at 200 ISO.

Re: Howto: Carl Zeiss Jena Tessar 50mm f2.8 servicing

Hmm mine clicks happily, the round pebble is the one that makes it click, along with the spring in that hole...

I'm glad the tutorial serves someone ! And yeah, I use the Flek for ALL my closup work too, I prefer it to the specialist "macro" lens for some reason; maybe the fact it is wider (being 35mm) helps...

Canon 5DII and a few lens -- Tachihara 8x10. Chamonix 45N-1, Crown Graphic 4x5. Moskva, Zeiss Super Ikonta C
Bronica S2A, Agfa Super Isolette, Iskra, Rolleiflex. Leica M2, Bessa R, Zorki 1,3,3M and a few more...

Re: Howto: Carl Zeiss Jena Tessar 50mm f2.8 servicing

buze wrote:

Hmm mine clicks happily, the round pebble is the one that makes it click, along with the spring in that hole...

Is the "round pebble" the thing that should be where the glue was in mine? If you ever open it again, please take a close-up picture of that area! Otherwise, I'll probably discover how it's supposed to look from another lens.

buze wrote:

I'm glad the tutorial serves someone ! And yeah, I use the Flek for ALL my closup work too, I prefer it to the specialist "macro" lens for some reason; maybe the fact it is wider (being 35mm) helps...

Yes, I now understand that! I just opened my Flek, as it needs some grease (just got it today - feels like christmas!) AND because I was thinking it might look the same as the Tessar. Two problems however. What shall I take the pictures with (20/2.8 is too wide, 50/2.8 too long, and I refuse to use the Canon 35 for posting on this forum, even if I focus it manually wink). Guess I finally have found a way to justify buying a second Flek. No, stop it! Bad Sjoerd.
The other is the fact that the Flek does not look the same. And I will not take it apart further... it is too good to touch wink
Anyhow, here's the Flek, seen by Tessar, after removal of the first three screws. Enough to apply some grease.

    http://esperanto.homeip.net/Sjoerd/flektogon35/2006_20D_0836-ete.jpg

Re: Howto: Carl Zeiss Jena Tessar 50mm f2.8 servicing

Sometime you don't need grease, a couple of drops of lighter fuel on the grease itself on the focusing barel is enougn to make it "better"  by fluidifying it. If there are no hard residue it can make it as good as new. I always try not to add new grease to old one; and it's a bitch to clean ALL of the old grease big_smile

Canon 5DII and a few lens -- Tachihara 8x10. Chamonix 45N-1, Crown Graphic 4x5. Moskva, Zeiss Super Ikonta C
Bronica S2A, Agfa Super Isolette, Iskra, Rolleiflex. Leica M2, Bessa R, Zorki 1,3,3M and a few more...

Re: Howto: Carl Zeiss Jena Tessar 50mm f2.8 servicing

buze wrote:

Sometime you don't need grease, a couple of drops of lighter fuel on the grease itself on the focusing barel is enougn to make it "better"  by fluidifying it. If there are no hard residue it can make it as good as new. I always try not to add new grease to old one; and it's a bitch to clean ALL of the old grease big_smile

Yes, you're right about that. Thanks for the tip!
Actually, I noted that the barrel itself did not really have a problem - the lens just needed to be cleaned between the fixed part of the barrel (part with the 22 16 ... 16 22 indication) and the rotating barrel. There was quite a lot of dust or sand there, which made a scraping noise while focusing (no, nothing compared to the auto-focus of a Canon 35/2...). I got rid of most of it without further taking the lens apart. Focusing only gets a bit harder after putting back the rear barrel casing.

Notice that this part of the construction of the Flektogon 35/2.4 is more like the 135/3.5 as described by Andy Brown than like the Tessar. It has the same four screws for the guidance and the one little infinity adjustment screw. I think the Tessar is different only because it is so short.

Btw. this lense is a joy to focus...

Oh and your tutorial really helps to set a standard for naming the different parts of the lens!

Last edited by Sjoerd (2006-10-09 15:35:43)

Re: Howto: Carl Zeiss Jena Tessar 50mm f2.8 servicing

Time to push this article wink

Thanks from Moers to buze for this work. I've bought a 'defect T aus Jena DDR' from my local dealer for just a few euros. I couldn't resist. After googling I found out that this is "our" CZJ Tessar 50/f2.8 for Export. And - I'm such a fool not looking here first - the best link leads to this forum and buzes site.

First: Read his instructions loud and carefully. I didn't do that and I lost the very very small switch metal stop ball. Sh... happens wink And I also failed to screw the front cover off, no chance. My wife decided that it was better to stay a few meters away...
Frustrated I played with the aperture mechanism - the aperture opens and closes smoothly. I wondered why it stucks when reassembled. It was the spring (15) of the aperture mechanism. Over the years this spring looses the strength needed to return the arm (16). One winding more and it worked fine!

After reassembling the lens - yes, it took hours to find the right position to screw the focusing barrels together in the right position - I got a perfect working copy of the tessar, only the a/m-switch is a little bit slackly until I find another small metal ball to fix this. And I wonder what to do: Using the lens for myself or selling it smile I'm afraid that my wife declares me to be mad...

Last edited by Borges (2006-10-09 11:36:35)

Re: Howto: Carl Zeiss Jena Tessar 50mm f2.8 servicing

Funny story Borges! And so typical! I think you have learnt a lot on this one, just like I did!

If I were you, I would not sell the lens - you would not get much for it anyway. Keep it as a memory! It's so small that it does not take much valuable space anyway...  Using it for taking pictures is another thing though... in my lens comparisons (yes, one day I will post my large 50mm comparison...) this lens comes last in terms of sharpness.

Now I still should open my second copy of this lens (came with a camera that came with a Flek 35 I wanted to buy... wink ), and get the aperture mechanism to work. Maybe it's the spring, just like in your case?!

Re: Howto: Carl Zeiss Jena Tessar 50mm f2.8 servicing

HI and thanks for posting those detailed pictures on how to disassemble the 50mm lens, I am having one heck of a time getting my infinity focus back, I must have had this lens apart 20 times trying to get it back but I cant seem to sort it. Can some one take a picture or tell me how the lens lines up when at infinity and when at closest focus. I am hoping that if you move it to infinity then tell me what the infinity mark lines up with on the writing around the lens I will be able to line it up without putting the whole lens back together to find infinity is not working, then have to strip it all down again..... for the 21st time! Why am I bothering, I dont know I guess I am bitten by the bug!

Re: Howto: Carl Zeiss Jena Tessar 50mm f2.8 servicing

I'm with hacksawbob !!. It has been 2 months since I got back to the point where we put the focusing barrels back together. Having gone around the mulberry bush on a few different occasions in the 1st few weeks and got nowhere I almost took a large hammer to the thing. Since then I have calmed down and now carry the two pieces around with me in the car. Whenever there is a traffic hold-up of some sort I take out the pieces and if it's a really good traffic jam I can get around all 10 points. Solves nothing but great therapy. Aaaaaaaaaaaaaaaaaaaaaaaaaagh that lens !!!!!!!!!!

Re: Howto: Carl Zeiss Jena Tessar 50mm f2.8 servicing

Hi there..

Well, I thought I would wake up this old one to say that the Tessar help page is still helping. I used it last weekend to strip and rebuild my identical Tessar. This is the first time I have gone as far as dismantling a diaphragm - but it was a complete success :-)

As always, re-threading the helicoid is a nightmare, but I am used to that by now...

Pete

E-M5 E-PL3, Zuikos, Tamron SP90

Re: Howto: Carl Zeiss Jena Tessar 50mm f2.8 servicing

Sorry to resurrect this but just wanted to say thanks to Buze for his article, after fixing my aperture last night so it works fine now, I spent the morning trying to reset the infinity focus, seemed I had it so many times but it still looked blurry through the viewfinder, finally I tried reversing the rear glass element as it was the only one I'd removed completely and that was it, despite my care (or what I thought was care!) I had managed to put it in backwards, lens is now perfect! :-) just thought I'd mention this in case anyone else was finding the same problem and hadn't thought to check that.. it's easily done!

Re: Howto: Carl Zeiss Jena Tessar 50mm f2.8 servicing

Recently I got digitalised. It's a Fuji S5.
Do you think the focusing helicoid or the lens groups can be moved so that I gain infinity on Nikon? I like Tessars and it would be interesting to have it as a portrait lens.