Repair of carl zeiss jena 135mm

Iranon · 10-04-2020, 12:23 PM

Hello, out of curiosity I opened up this lens and I can't quite put it back as it was.

I have only partially dismounted it (the top portion up to the aperture selection mechanism). There are two tiny metal spheres which fell out but I believe I put them back in the correct place. The one thing that bothers me is that the automatic-manual switch is a bit loose. Any suggestions?

Thank you

**PJ1** · 10-04-2020, 02:20 PM

The "metal spheres" are ball bearings that sometimes provide friction in switches. Anyway, I have a copy of an article "The Complete Guide to Disassembling and Cleaning the Carl Zeiss Jena 135mm f/3.5 Lens". It does not show the "zebra" lens but I think the mechanics of the 135/3.5 were all the same. I will PM you so I can send you a copy of the article if you would like it.
Peter

Iranon · 10-04-2020, 02:33 PM

Indeed I had misplaced the second bearing, now the switch clicks nicely.

**Fenwoodian** · 10-04-2020, 02:57 PM - **1 Like**

.
If one doesn't know what they are doing when disassembling a lens it's always a good idea to video the entire process. If this type of thing happens again, you can watch the video and all of your re-assembly questions will be answered.

10-04-2020, 12:23 PM	#1
Iranon New Member Join Date: Feb 2019 Posts: 6	Repair of carl zeiss jena 135mm Hello, out of curiosity I opened up this lens and I can't quite put it back as it was. I have only partially dismounted it (the top portion up to the aperture selection mechanism). There are two tiny metal spheres which fell out but I believe I put them back in the correct place. The one thing that bothers me is that the automatic-manual switch is a bit loose. Any suggestions? Thank you

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10-04-2020, 02:20 PM	#2
PJ1 Site Supporter Join Date: Jul 2012 Location: Mosquito Creek, Australia Photos: Gallery \| Albums Posts: 4,454	The "metal spheres" are ball bearings that sometimes provide friction in switches. Anyway, I have a copy of an article "The Complete Guide to Disassembling and Cleaning the Carl Zeiss Jena 135mm f/3.5 Lens". It does not show the "zebra" lens but I think the mechanics of the 135/3.5 were all the same. I will PM you so I can send you a copy of the article if you would like it. Peter

10-04-2020, 02:33 PM	#3
Iranon New Member Join Date: Feb 2019 Posts: 6 Original Poster	Indeed I had misplaced the second bearing, now the switch clicks nicely.

10-04-2020, 02:57 PM - 1 Like	#4
Fenwoodian Site Supporter Join Date: Apr 2015 Location: Wisconsin, USA Photos: Gallery \| Albums Posts: 2,715	. If one doesn't know what they are doing when disassembling a lens it's always a good idea to video the entire process. If this type of thing happens again, you can watch the video and all of your re-assembly questions will be answered.

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