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Watzmann
Tinkerer
Username: Watzmann
Post Number: 2
Registered: 10-2007
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, November 09, 2007 - 01:43 pm: | 
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Hi,
has anyone tried to open the front lens element from an agfa billy record (apotar lens)? I can see a litle bit fungus between the two lenses, but i don't know if there is a trick to unscrew it.
Bye
Wolfgang |
John_scott
Tinkerer
Username: John_scott
Post Number: 13
Registered: 08-2006
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, November 16, 2007 - 02:44 am: |
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An Apotar is a three-element lens, and such lenses are focused by turing the front lens. So getting the front element off is quite easy. First loosen the set-screws in the aluminum focus ring, and remove it. Then you can unscrew the front element.
The other two elements are mounted in a brass collar that seats in the shuter housing. There is a threaded brass ring that holds the middle element on the rear element.
Tip: find a way to make sure you get the middle element back in correctly. These are concave on both sides, and each side looks the same to me. A few times I have gotten them back in up-side-down, and then the camera will not focus. |
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