| Author |
Message |
    
Jesse
Tinkerer
Username: Jesse
Post Number: 9
Registered: 08-2006
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, January 06, 2007 - 07:36 am: | 
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Hi
I have a SMC Takumar M42 lens, 3.5/35mm, and the diaphragm is jammed. The aperture ring moves and clicks in but the iris does not respond. Also, it's locked in auto mode and can't move it to manual. In auto mode the aperture pin does not have any effect while the diaphragm is jammed. The annoying thing is that yesterday I managed to move it to manual mode (only once) and then diaphragm worked. Moved it back to auto and back to the same problem. Have not been able to move it back to manual again. Glass is excellent and cosmetically like new so hope it's not a case of having to bin it! Any help appreciated, regards jess.. |
Chekawa
Tinkerer
Username: Chekawa
Post Number: 19
Registered: 10-2006
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, January 09, 2007 - 12:15 am: |
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Do not force it to move in any direction. It may damage it beyond repair. Remove the lens and look at the problem. It just night be a bent pin. |
John_f
Tinkerer
Username: John_f
Post Number: 12
Registered: 07-2006
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, January 09, 2007 - 12:54 am: |
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These lenses have a "guard pin", which prevents the button being moved to manual, unless the lens is mounted on a camera. This pin is what locks these lenses on Zenit and Mamiya cameras. The pin drops into one of the lensmount screw holes. |
