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Rob
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, June 17, 2006 - 09:09 am: | 
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I recently picked up a Meyer Optik Gorlitz lens that came with a Praktica on Evil Bay. The lens is out of focus and the aperture doesn't stop down. Any ideas on how to open it up. I have the rear lens cell off already, but the rest is a mystery. |
Glenn Middleton
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, June 17, 2006 - 09:43 am: |
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It might make the process of giving an answer much quicker if you specify the lens type. Meyer produced a whole heap of lenses. |
Rob
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, June 17, 2006 - 12:07 pm: |
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Sorry Glenn, brain fart.
It's a Domiplan 2.8/50mm in M42 mount. |
Glenn middleton
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, June 17, 2006 - 07:19 pm: |
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Last used one of these about 40 odd years ago, so no specific information.
If you have not found any screws in rear of mount, try unscrewing the rear ring/shroud off the mount proper. This should get you into the back off lens. You can also try unscrewing the front shroud/name ring out of the filter threads or off the front of lens. Use a rubber bung or a piece of rubber glove for the front and the rubber glove for the rear.
Sorry I cannot be more specific on this. Also note that these thoughts are based on the lens being the classic 'zebra' version, there is a plastic barreled version that looks very different in pictures I have seen.
No doubt somebody will come up with the exact information. |
Tony Duell
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, June 19, 2006 - 11:56 am: |
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From what I remember, you go in from both ends...
At the front, you unscrew the name 'ring'. It's actually funnel-shaped. Some older Domiplans have a setscrew to lock this -- look on the sloping surface between the name and the front element (if you see what I mean). If there's a screwhead there, loosen it (no need to remove it completely) before removing the name ring.
Then, set the aperture ring to f/22, hold the lens as it would be on the camera, but with the f/2 mark uppermost, and pull out the aperture ring. There's a large spring ring round the back of it, and a spring-loaded ball in a hole in the aperture ring. Don't loose them.
The front lens cell then unscrews in the obvious way.
At the back, there's a trim ring round the outside. Unscrew this first. Then you'll see a semi-circular lever that's got a pivot screw at each end and is pushed by the stop-down pin. Undo the pivot screws and remove the lever.
A few more screws (3?) hold the mount section in place. Remove these. Pull off the mount. Don't loose the stop-down pin (it's now free), or the spring-loaded blocks that keep the mount alinged. Take those out (but note how they go).
The rear cell is held in by 3 setscrews that clamp onto the edge of the cell. Don't remove the 3 larger screws that go in from the back (parallel to the axis of the lens). If you do, the diaphragm blades fall out (this is the voice of experience).
You could try flood-cleaning the diaphragm _and the lever inside the front section of the mount_. |
Rob
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, June 25, 2006 - 03:08 pm: |
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Thank you Tony. It's all making sense now.
Thanks to everyone.
Rob |
