Topic
Topic author: Michl
Posted on: 20100921194250
Hello,
I have a problem with my Jupiter-11. I got it in a very good condition, but the pictures that I took with it, have been blurred. So I tried to dismantle it. Unfortunately I couldnt find a description, how to do that.
(Its a silver, thin Jupiter-11 with M39-Mount)
For tests, I took my Zorki-3 without back but with an attached focusing screen. The camera is working very well. It has correct 28,8mm-flange and the rangefinder also works correct.
At first I divided the lens in the middle, like a Jupiter-8. Now I had two parts. The front-part with the glass-lenses and the rear-part with a complex helix. I changed the setting of the helix. Now it was better. The rangefinder showed me the same result as the focusing screen. But the meter-scale on the lens didnt fit to this result. When I set the lens to infinitely, the scale showed me 30 meters. When I set the lens to 3 m, the scale was between 3m and 2,5m. So I think, the distance from the front-part of the lens and the rear-part is not correct. I measured the different length of the lens between the correct setting and the setting on the scale. It was about 0.7 mm. Between the front- and the rear-part of the lens are some very thin plate-washers. I took a paper, that is about 0.7 mm thick and cut a "plate-washer" out of it. I assembled the Lens with this selfmade plate-washer. Now it works correctly, but the diaphragm-scale is not longer at the top of the lens. Its on the right side now. I cant find a way to move this.
Now my questions:
1. If anybody knows the system of this lens, what do you think about my way to repair the lens. Is it the correct way? Or did I do a mistake?
2. Does anybody know, how to move the diaphragm-scale to the top?
3. Does anybody have a description, how to repair the Jupiter-11?
4. Where can I get new metal-plate-washers?
Sorry for my bad English. Hope, you can understand me.
Thank you, and Greetings from Germany.
Michl
I have a problem with my Jupiter-11. I got it in a very good condition, but the pictures that I took with it, have been blurred. So I tried to dismantle it. Unfortunately I couldnt find a description, how to do that.
(Its a silver, thin Jupiter-11 with M39-Mount)
For tests, I took my Zorki-3 without back but with an attached focusing screen. The camera is working very well. It has correct 28,8mm-flange and the rangefinder also works correct.
At first I divided the lens in the middle, like a Jupiter-8. Now I had two parts. The front-part with the glass-lenses and the rear-part with a complex helix. I changed the setting of the helix. Now it was better. The rangefinder showed me the same result as the focusing screen. But the meter-scale on the lens didnt fit to this result. When I set the lens to infinitely, the scale showed me 30 meters. When I set the lens to 3 m, the scale was between 3m and 2,5m. So I think, the distance from the front-part of the lens and the rear-part is not correct. I measured the different length of the lens between the correct setting and the setting on the scale. It was about 0.7 mm. Between the front- and the rear-part of the lens are some very thin plate-washers. I took a paper, that is about 0.7 mm thick and cut a "plate-washer" out of it. I assembled the Lens with this selfmade plate-washer. Now it works correctly, but the diaphragm-scale is not longer at the top of the lens. Its on the right side now. I cant find a way to move this.
Now my questions:
1. If anybody knows the system of this lens, what do you think about my way to repair the lens. Is it the correct way? Or did I do a mistake?
2. Does anybody know, how to move the diaphragm-scale to the top?
3. Does anybody have a description, how to repair the Jupiter-11?
4. Where can I get new metal-plate-washers?
Sorry for my bad English. Hope, you can understand me.
Thank you, and Greetings from Germany.
Michl