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Re: [OM] fisheyes

Subject: Re: [OM] fisheyes
From: "John Hermanson" <omtech@xxxxxxxxx>
Date: Fri, 5 Dec 2003 16:12:04 -0500
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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