Topic: Carl Zeiss Jena 35mm f/2.4 Flektogon aperture system cleaning

Has anyone followed this procedure:

http://www.kolumbus.fi/uusilehto/img/le … ss/disass/

Today, I tried it because my aperture blades were sticking open. In the past, I've fiddled with the M/A switch and gotten the leaves moving again but today no such luck. Maybe the warmth of California has let the oil flow more than in did in the midwest.

I was able to follow the procedure up to step 4. That means I removed the three rear screws, lifted off the rear exterior of the lens. Then loosened the internal element set and removed it. Then removed the three internal screws around the aperture blade mechanism. But I couldn't figure out how to take the front exterior of the lens off in order to get to the front interior element set.

I settled for cleaning the blades from the rear. This worked well. From the front, I still see a tiny bit of oil on the blades however it was easy to get that far so if it binds up, I can do the same procedure again. However it would be nice to get the front element set off so I can clean the aperture blades from the front.

Re: Carl Zeiss Jena 35mm f/2.4 Flektogon aperture system cleaning

Two test images of son Kai (I think both at f8 using Sony A7):

https://c6.staticflickr.com/8/7537/27412429141_c830206628_h.jpgDSC02051 by Cymen, on Flickr

https://c7.staticflickr.com/8/7349/26875210494_185620b0a9_h.jpgDSC02045 by Cymen, on Flickr

Last edited by cvig (2016-06-05 19:43:45)

Re: Carl Zeiss Jena 35mm f/2.4 Flektogon aperture system cleaning

I just cleaned the aperture blades of my flektogon 2,4/35 ,  this i's the second time in 16 years : you don't need to unscrew anything but the ring retaining the rear lenses .
From this , you can clean the aperture blades with a Q-tip drenched in alcohol .This  is a long process : clean , wipe , let dry and again and again .
And your  aperture blades  will jump   nervously in open or close position ...

  Congratulations for this beautiful baby !

I am a Pentacon and kiev( MF and35 mm) user,and also :contaxII,III,IIa  ,contaflex , contarex bullseye ,voigtlander ....

Re: Carl Zeiss Jena 35mm f/2.4 Flektogon aperture system cleaning

To unscrew the front lens assembly as a whole just unscrew (CCW) the whole black front lens housing (with the Carl Zeiss Jena inscription ring still in place). (There are several versions of the Flektogon 2.4/35, some of them feature a tiny set screw to prevent this, but most of them don't.) Then you gain access to the whole front lens assembly, which can be taken out by simply unscrewing the outermost ring on the top. Do not loosen any other of the rings.