Sounds like a linkage has failed. On a couple of Pentax lenses I've opened up it was a simple
bar with a fork that ran up and down the bar. (The aperture lever would move the bar which would
move the fork which would stop down the lens). All that was required was to re-seat the fork on the
bar and bend it slightly to keep it from sliding off. If that's the problem it should be an easy fix.


Henri Toivonen wrote:

I got a good deal on a SMC 135/2.5, very cheap, but it doesn't work properly.
The aperture lever on the back isn't working. It moves but doesn't affect the aperture at all.
There isn't oil in there, it's somekind of mechanical thing.


Clues? Easy to fix? Worth the effort?
I would be getting it for some $20-25.

/Henri






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