horrid English grammar on second lecture - excuse me , list.
Fernando
Fernando Gonzalez Gentile wrote:
> 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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