Sorry, overlooked the fact that you already knew about the brass ring.
----------------------------------------------------
John Hermanson www.zuiko.com
mail: omtech@xxxxxxxxx
Camtech, Olympus Sales & Service since 1977
21 South Lane, Huntington NY 11743-4714
631-424-2121 Turnaround 4-5 weeks
----------------------------------------------------
----- Original Message -----
From: "andrew fildes" <afildes@xxxxxxxxxxxxxx>
To: <olympus@xxxxxxxxxxxxxxx>
Sent: Thursday, December 04, 2003 10:32 PM
Subject: Re: [OM] fisheyes
> >andrew fildes wrote:
> >>Both the 8mm and the 16mm had a UV filter in the early type replaced
> >>by a 'neutral' filter in the later.
> >
> >I'd never noticed this. Mine's an early one with a UV filter. When
> >I checked this, I noticed a bit of weirdness with the front element.
> >It looks like it's got bubbles around the edge. It almost looks
> >like element separation, but according to the e-sif and parts
> >diagram, the front element is just a single piece of glass. So, I
> >removed the front element to investigate further. One thing that
> >the e-sif doesn't show is that there's a brass ring glued to the
> >back of the element. From the parts diagram, this might be CA165300
> >and/or CA160600. It's extremely hard to tell where the bubbles are
> >on this very curved lens, but I'm thinking they might be from the
> >brass ring pulling off. Has anyone seen this before? Does anyone
> >know if it is possible to remove this ring, repaint the back of the
> >element, and reglue the ring?
> >
> >Mark
>
>
> Paint loss or adhesive failure is the most likely reason. I have a
> couple of other brand lenses where there is glue failure causing
> white spot (Leica/Minolta 28mm for the CLE is a classic example where
> almost all have it) - looks fungally alarming but usually has no
> effect and is stable, although on a fish there may be a flare or
> reflection issue as a hood is impossible. It's cosmetically annoying
> too.
> Ideally, strip the brass ring, remove all paint, repaint and reglue
> the ring lightly if absolutely necessary. Awkward job given that you
> are handling a large and rare element.
> AndrewF
> (if you drop the element - I'll buy the rest of the lens :)
>
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