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UPDATED: Carl Zeiss Jena DDR MC Flektogon 20mm f/2.8
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PostPosted: Tue May 14, 2013 1:06 am    Post subject: Reply with quote
Hello folks,

I got some good news/bad news.

I successfully removed the MD mount. It looks like it was a screw mount. However, the threading appears to be too small for my m42 adapter. In other words, the lens goes right into my m42 adapter (but does not screw in whatsoever). I feel as if the actual m42 screw thread mount was removed (and/or made smaller) to compensate for the MD plate (MD plate screws in but the m42 adapter, does not).

On a side note, after removing the MD plate, it appears to have been de-clicked. No more of that strange clicking noise. Also, there is no evidence of an aperture pin. Auto gets it wide open while Manual lets me choose aperture without any clicks.

Any thoughts as to what I should do now?

Attached is a picture:



PostPosted: Tue May 14, 2013 1:19 am    Post subject: Reply with quote
i think the silver screw ring should be removed


PostPosted: Tue May 14, 2013 1:27 am    Post subject: Reply with quote
It's been modified, sadly. The aperture pin is gone so they've had it apart and played with the aperture linkage, that will be why it doesn't click, I bet they lost the little ball bearing that makes the click.

Here's what I suggest, as a possible solution. On ebay you can buy M39-M42 adapter rings for a couple of bucks. Get one of those and try to fit it on the back. You will probably have to do a bit of filing of the inside of the adapter to ring and it will take a bit of trial and error, but with some patience you should be able to restore it so it again has an M42 thread on the back.


PostPosted: Tue May 14, 2013 8:03 am    Post subject: Reply with quote
looks like the screwm mount was ground off, so you have to restore it, maybe you can screw or glue an M42/EF adapter onto the lens.
If you like to get the lens in original condition, I can give you a contact to a well regardet East German craftsman who is specialised in repairing Zeiss Jena & Meyer lenses.


PostPosted: Tue May 14, 2013 8:31 am    Post subject: Reply with quote
timo832000 wrote:
looks like the screwm mount was ground off, so you have to restore it, maybe you can screw or glue an M42/EF adapter onto the lens.
If you like to get the lens in original condition, I can give you a contact to a well regardet East German craftsman who is specialised in repairing Zeiss Jena & Meyer lenses.


I think that this lens deserves a try in this direction: considering how little you paid it, chances are that after repair you'll end up with an excellent lens in perfect condition, and you'll still have made a good deal.


PostPosted: Tue May 14, 2013 4:13 pm    Post subject: Reply with quote
iangreenhalgh1 wrote:
It's been modified, sadly. The aperture pin is gone so they've had it apart and played with the aperture linkage, that will be why it doesn't click, I bet they lost the little ball bearing that makes the click.

Here's what I suggest, as a possible solution. On ebay you can buy M39-M42 adapter rings for a couple of bucks. Get one of those and try to fit it on the back. You will probably have to do a bit of filing of the inside of the adapter to ring and it will take a bit of trial and error, but with some patience you should be able to restore it so it again has an M42 thread on the back.


This suggestion worked! Thank you very much for the advice!
The fix was easier than I thought. I went to my friends house and we found a M39-M42 adapter ring. It screwed on perfectly and adapted just fine to my m42 adapter. No filling etc. necessary.
I don't think I am going to bother doing a CLA on this lens. Clean optics suggest they went ahead and cleaned everything when they did the modification. On a side note, are the aperture blades supposed to be a bit visible @ f/2.8? (I understand this may be the case since it is a wide angle lens).
Attached are some pictures for viewing pleasure (this is with the M39-M42 adapter ring on):



I will take the lens for a spin and post pictures soon.
-George


PostPosted: Tue May 14, 2013 4:26 pm    Post subject: Reply with quote
Great, pleased it was a simple fix! I have loads of lenses that you can still see the blades when fully open, so I don't think it's an issue, but someone with a Flek 20 can confirm.


PostPosted: Tue May 14, 2013 6:21 pm    Post subject: Reply with quote
Please don't change title next time , just simple reply updated, if you change title it cause broken links in search engines. A simple reply give enough attention and people will read post again.


PostPosted: Tue May 14, 2013 6:43 pm    Post subject: Reply with quote
Attila wrote:
Please don't change title next time , just simple reply updated, if you change title it cause broken links in search engines. A simple reply give enough attention and people will read post again.


Sounds good. You might want to disable that feature so it doesn't happen again.
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