Same warning.
The most reputed repairman in Montevideo, told me more than once that is
not a common grease.
My 21/3,5 suffers from the opposite illness, fortunately not in the
aperture ring but in the focusing ring: it is rather loose, 'though I
can perfectly use the Zuiko. Asked more than once if he could fix this
almost non-issue, but he refused; alleging that kind of lubricant was
very difficult to find here in town. I suppose both the aperture ring
and focusing ring use the same type of lubricant.
FWIW
Fernando.
Chuck Norcutt wrote:
> A warning that I'm overstepping my bounds here but, from looking at the
> parts diagram, I would agree that it looks as though the aperture ring
> should simply slide off. If the grease has solidified to the point of
> preventing the ring from turning (as Mark's note hypothesized) then I
> would not be at all surprised that it's that same solidified grease
> that's acting as a glue between the two parts and also preventing you
> from sliding it off as well as turning it.
>
> If it were me I would very gradually feed some drops of a solvent such
> as Ronsonol lighter fluid around the inner diameter of the aperture ring
> and perhaps on its back face. Also maybe a drop or two in the groove
> that appears to slide over the actuating pin Mark mentions. Just don't
> use so much that it ends up dripping and running inside the lens.
>
> If the grease is totally dried out and has evaporated off all of its
> volatile components I'm not sure warming can help much. It probably
> does need a solvent to loosen it up.
>
> On the other hand I think this is a very expensive piece of glass... so
> ignore what I just said. :-)
>
> Chuck Norcutt
>
> Alan Wood wrote:
>
>> In 2001, Mark Dapoz kindly provided some advice:
>>
>> Chances are that the grease around the aperture ring has solidified
>> and is preventing it from turning. Use a rubber stopper to twist the
>> front part of the lens off, it's just a big retaining ring. The
>> aperture ring should then easily come off. You will then see a
>> little pin sticking out from the barrel. Try moving that pin, it
>> should move freely and close the aperture. If it doesn't then you
>> have other problems and it's best to get the lens CLA'd. If it does
>> move freely, just clean up the grease on the aperture ring and
>> re-lube it using an appropriate grease.
>>
>> ----------
>>
>> It has taken me 7 years, but I have finally managed to unscrew the
>> front ring (the one that says ZUIKO MACRO etc.). Now I cannot get
>> any further. The aperture ring (the first knurled ring) will not
>> come off. I have tried gently warming it.
>>
>> Please does anyone have any suggestions for loosening it? Maybe a
>> solvent?
>>
>> Thank you
>>
>> Alan Wood http://www.alanwood.net (Unicode, special characters,
>> pesticide names)
>>
>>
>> ------------------------------------------------------------------------
>>
--
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