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[OM] Re: SOLVED! (was Repairing sticky lens aperture?)

Subject: [OM] Re: SOLVED! (was Repairing sticky lens aperture?)
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxx>
Date: Tue, 09 Aug 2005 17:19:26 -0400
Hey, great news!  Now the next question.  Where did the foam come from?

Chuck Norcutt

Philip Pemberton wrote:

> Hi folks,
>   Well, I've sorted it. Took apart the back section of the lens and had a
> look at the aperture slats - hmm, not a speck of oil on them - just a
> clean, uniformly black iris. Not only that, but when I manipulated the lever
> with a small pair of tweezers, it felt completely smooth. So I did the next
> logical thing - I pulled the mounting base apart.
> 
>   After I did that, the cause of the stickiness was immediately apparent. Two
> pieces of oily yellow foam had wedged themselves inside the aperture return
> spring. Needless to say, these quite sizable pieces of foam were reducing the
> spring's effectiveness to the point where the aperture would not spring back
> open properly on the smaller apertures (anything smaller than f8). Removing
> the foam with a toothpick seems to have sorted the spring out - now the
> aperture is working well enough to make the lens usable without the "lens
> dance".



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