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Berkbs
Tinkerer
Username: Berkbs
Post Number: 16
Registered: 10-2006
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, June 12, 2008 - 11:23 am: | 
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Hi there
I got hold of a prewar Zeiss Ikon Ikonta /without light meter) with uncoated Tessar. The speeds are off, and pne of the aperture blades is stuck. I need to remove the shutter assembly to take a look but I do not know how to do that. I need help with how to remove the shutter from the bellows. Any pointers? And will it be a lot of work to fix the aperture blades?
Thanks, Berk |
August
Tinkerer
Username: August
Post Number: 14
Registered: 06-2008
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, June 13, 2008 - 11:50 am: |
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I think that removing the shutter assembly from the bellows is a simple matter of unscrewing the retaining ring from the back. Open the back with the camera folded, you'll see the outermost ring around the rear lens element has either 2 or more likely 4 notches for a spanner wrench. I have not done this on an Ikonta but on the very similar Nettars of the same period it is pretty straightforward. Once this ring is removed the whole shutter/lens will fall right off the front of the bellows, there is nothing else holding it on.
You may not need to do this though. Probably, without taking off the shutter, you can just open it from the front to get access to the shutter (a Compur I assume) and that will certainly enable you to clean the works which may fix the issue with the speeds. To get at the shutter blades you will have to do more disassembly but, again, it could be either on or off the camera.
August |
August
Tinkerer
Username: August
Post Number: 15
Registered: 06-2008
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, June 13, 2008 - 12:25 pm: |
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On fixing the blade, choose whichever shutter on Dan Mitchell's page is most like yours (probably Compur or Compur Rapid) for a guide on tearing down. Personally, I would try like the dickens to loosen up the shutter blades with as little disassembly as possible.
http://www.daniel.mitchell.name/cameras/index.php
Note one pitfall which is concealed by Dan's glib first sentence, "Remove the front and rear lens elements from the shutter." On some folders (Voigtlander, Agfa) that's easy. On Zeiss-Ikons it is hard. The lens elements immediately adjacent to the shutter blades on both sides are held in place by snap rings that are difficult to take off safely. See my recent thread on the subject.
https://kyp.hauslendale.com/classics/forum/messages/2/12557.html?1213323761
As detailed there, I am batting .500 with these, having removed a (middle element, easier) snap ring successfully two nights ago but destroyed a Novar last night while trying to remove the (rear element, tougher) snap ring. I don't think I would have the nerve to try it on a Tessar. So if I were you I would just hope and pray that cleaning the shutter works frees up the stuck blade.
August |
Rick_oleson
Tinkerer
Username: Rick_oleson
Post Number: 597
Registered: 07-2006
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, June 13, 2008 - 04:41 pm: |
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If you have ONE aperture blade stuck, that means that its pivot pin has come out of its hole in the actuating plate. This usually indicates a pretty serious case of gummy blades, so between having to clean them and having to maneuver that pin back into its hole, you may just have to bite the bullet and do the disassembly. As noted above, it may not be necessary to remove the shutter from the bellows to do this. |
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