On Tue, 2 Jul 2002, C.H.Ling wrote:
>
>
> T.Clausen@xxxxxxxxxxxx wrote:
> >
> > On Tue, 2 Jul 2002, C.H.Ling wrote:
> >
> > <SNIP>
> >
> > > common problem of element separation on a rear lens group. The 65-200
> > > has a common problem of an inside element (also rear group) getting
> > > oil vapor on the surface, when long enough without attention, the
> > > element will permanent damage. I found two 35-70/3.6 and two 65-200
> > > has these problem and hard the same problem from my friends too.
> > >
> >
> > <SNIP>
> >
> > Ahh, that was the problem I was recalling with the 65-200. Anyone knows if
> > it is easilly fixable?
> >
> > Also, just to expose my ignorance, why does exposure to oil vapor damage
> > the lens elements (is it the glass or the coating?)
>
>
> My first 65-200 is cleanable, I had clean it myself ... totally three
> times in a year, the oil get back in a few months. I have fully
> disassembly the metal tube which holding the lens elements, drop them
> into soap water and clean them but it doesn't help.
> It was very
> interesting, only one surface of an element inside the tube has this
> problem, the other elements were clean (IIRC there is four element
> inside the tube).
>
> For the last sample from ebay, the element was not cleanable (same
> element), could be coating damage (and very serious which looks like a
> thick cloud), I don't know exactly how it happen just expect it was
> caused by the oil.
Interresting, indeed. Wonder where all that oil comes from in the first
place. Anyways, C.H.Ling, thanks for confirming that I made a good choise
not going for the 65-200.
Thanks for the info.
--thomas
>
> C.H.Ling
>
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--
-------------------------------------------
Thomas Heide Clausen
Civilingeniør i Datateknik (cand.polyt)
M.Sc in Computer Engineering
E-Mail: T.Clausen@xxxxxxxxxxxx
WWW: http://www.cs.auc.dk/~voop
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