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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