I've only worked on a few of these, and those many years ago, so my
recollections are a bit hazy. But the parts page seems to show that once
the front retaining ring has been removed (and the front element), the frame
containing the front lens group, CA190200, should unscrew from the front
body, CA248600. Alas, because of the location of the threads, there's no
way I can see to administer solvent to loosen any adhesive between the two.
But there appear to be notches on the front edges of the front lens group
frame, and there may also be spanner holes closer in, behind the front lens
element.
Note that the front body with the serial number, etc., on it does NOT
unscrew -- it's attached to the rear body by screws. The front lens group
frame screws _into_ the front body. In other words, if you're trying to
turn the whole front of the lens, it won't work.
You might also try removing the flange (CA193000) over the ring that holds
the filters (CA192400) -- that might let you blast some air into the opening
in the side of the body and stir around any debris on the filters.
> I need some advice on the Zuiko 8mm fisheye.
>
> Mine has a lot of dust and other particles on the internal filters.
> Looking at the exploded view at:
>
> http://olympus.dementia.org/Hardware/PDFs/8mm_f2.8.pdf
>
> I think the only way to get to the filters is dissasembly of the lens from
> the front.
>
> I can take of the retaining ring of the big front element, but it feels
like
> the holder for this element (quite a large piece of aluminium) is glued
> tight! I have to put that much force to it that I don't feel confident
> anymore. It just won't move at all! I'v tried with a (large!) spanner, but
> it is difficult to put force on it, and it bent slightly already under my
> force. I tried with rubber gloves and both my hands without any
movement...
>
> Are there some experienced with this lens on the list? Was there a special
> tool made for this by Olympus?
>
> Thanks in advance,
>
> Iwert.
>
>
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