Sorry, I don't know any details on the 300/4.5 but perhaps the exploded
parts diagram from Mark Dapoz's site will help
<http://olympus.dementia.org/Hardware/PDFs/300mm_f4.5.pdf>
Chuck Norcutt
Gary W. Marklund wrote:
> Chuck,
>
> Thanks for the very helpful reply. Unfortunately, it isn't on the
> outside. Good news is, I got the name ring off without incident or slip.
> Also, the second ring. I'm still digging. The third ring seems
> different, if there is one. I don't see any slots to take a spanner.
> Looks like I'm getting close to the fungus, but don't know how to remove
> the third element. Any ideas?
>
> Thanks again,
> Gary
>
> Chuck Norcutt wrote:
>> Depends on what you consider "salvaged". If the fungus hasn't been
>> there very long and is not widespread you may be able to clean it off
>> without any apparent ill effect. But fungi exude acids that will etch
>> whatever they're living on. Fortunately, life as a fungus doesn't
>> proceed at anything like a torrid pace. I have cleaned fungus spots off
>> a couple of lenses where I can't tell there was ever anything there...
>> meaning I can't locate exactly where the fungus was.
>>
>> If it's on the outside you are lucky and can easily clean it. If it's
>> on the inside you may not be able to do anything. According to
>> discussions that were going on here recently the 300/4.5 has a tendency
>> for the name ring to be assembled with glue and too much of it at that.
>> It may be next to impossible to unscrew the name ring to get the lens
>> open for cleaning.
>>
>> When cleaning fungus I have used John Hermanson's suggested method which
>> is to use a dab of women's cold cream. I think he specified "Pond's"
>> brand but I used whatever my wife had in her cosmetics drawer and it
>> worked fine. The other cleaner (taught by the Olympus factory "sensei")
>> was "nose oil". That's exactly what it sounds like. Skin oil picked up
>> by rubbing your finger on the tip of your nose and then rubbing your
>> finger tip on the fungus spot. Skin oil (fortunately for us) has
>> anti-fungal properties and the tip of the nose is liberally supplied
>> with oil glands.
>>
>> Chuck Norcutt
>>
>>
>> Gary W. Marklund wrote:
>>
>>> I have an Olympus Zuiko 300mm f/4.5 that has a couple of fungus "stars".
>>> Does anyone know if this is salvageable? I only discovered them when I
>>> went to list the lens for sale.
>>>
>>> Thanks,
>>> Gary
>>>
>>>
>
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