Question about Nikon 105mm f/2.5 Nikkor Ai-S Lens

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Aperture cannot open fully

Just bought my 105mm/2.5 ais recently. The diaphragm worked normally when i turn the aperture ring. However when i mounted it to my FM2. i was not able to open the aperture fully when i was at full close focus(lens fully extended). this happens when i put the aperture at f22. It open fully at larger aperture. When i released the shutter, the aperture closed to its minimum and refused to open (sometimes it open v slowly) This problem does not happen when I am at far focus(lens fully retracted). I've sent the lens back for lubrication but it came back with the same problem. Any idea wat's wrong and how to rectify it? Thanks

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  • Anonymous Mar 15, 2014

    Often the lens automatically close.

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  • Master
  • 667 Answers

As you have found out, it is not a lubrication issue. It would seem that your lens has a problem with the linkage arm inside the mount. The arm that extends out of the mount could be bent or misaligned. It would be fixable, but the parts are somewhat delicate. Best to let a good repair person have a look.

Posted on Dec 29, 2007

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Posted on Jan 02, 2017

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