The coupling rings in the rear of the lens (often the cause of slow blades
in the 50 1.8) should be dry as a bone, no lubrication, for best operation.
John
john@xxxxxxxxxxxxxxxxx wrote:
> On Thu, 12 Mar 1998 14:04:50 -0500, you wrote:
>
> >
> >Hi all:
> >My first zuiko ever, a 50/1.8, has developed a sluggish diaphragm for
> >the second or third time since I got it in 1980. I'm pretty sure this
> >lens is not worth sending off to be fixed yet again. Has anyone on the
> >list ever pulled one of these lenses apart and fixed a sticky diaphragm
> >themselves? I think this is just the kind of info that would make a
> >good addition to the camera repair FAQ. Failing this, how much to you
> >charge to fix this problem, John?
>
> Although at first sight you may think the blades themselves are
> sticking (a difficult job to tackle oneself) it may just be the
> linkage between the operating tab on the mount and the ring that
> closes the blades (a relatively easy job).
>
> Press the DOF preview button and rotate the aperture ring between its
> extremities. Are the blades still sluggish? If they're not, the
> linkage is sticky and you're in luck. After my 35 F2 had made several
> trips to a supposed authorised Olympus repairer over here who
> repeatedly missed this point, I removed the lens mount and applied a
> tiny dab of moly disulphide paste to the linkage pivots. It's worked
> perfectly ever since (more than 20 years).
>
> Personally I wouldn't dare try to dismantle the lens "core" or the
> diaphragm assembly myself, though there may be some on the list who
> are braver than me!
>
> Regards
>
> --
> John Gruffydd (Mold, Wales, UK)
>
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