If you mean the little black specks, they're usually black paint chips. Some
1.4's are virtually impossible to disassemble -- if we can't them open easily,
we've learned to let them be. A little debris will not greatly affect image
quality anyway, but it may provide a "starting place" for fungus. Clean it if
it's easy, but if not, use it 'till it dies.
If you're seeing white bubbles, we've noted that for years on some 1.4's --
never found out for sure why it happens, but never have noticed any degradation
of image quality, though it's not very attrractive (I've used one of these for
almost 20 years!). Again, use it 'till it dies....
Bernd Moeller wrote:
> Hi,
>
> Yesterday I was checking some of my Zuikos and was shocked when I saw lots of
> small dots or specks inside my recently bought 50/1.4 MC. None of my lenses
> suffers from fungus, and I still hope that it is not the case with this lens.
>
> The matter has been discussed here quite often, but I wonder whether there is
> a safe method to determine if it is infected. If it is, it must be in a very
> early stage, as the dots seem to be only tens of millimeters in diameter. I
> saw them in daylight coming into the lens at a certain angle. They do not
> show the characteristic pattern, but look like the tiny air bubbles on an
> object that has just been but into frech water. It looks as if they are on
> the 2nd lens behind the front element.
>
> Can it be dust or condensed oil? As I don't know the story of this lens, I
> cannot be shure if it has been maltreated, e.g. with heat that could have
> caused the oil to evaporate. It does not really look like dust, on the other
> side, and only one glass surface seems to be affected. This, however, is
> rather unsafe to determine due to the curving and the enlargement within the
> lens.
>
> What shall I do? The lens only costed me 40 $ or so as it has a tiny scratch
> on the front element. Any chance to open and clean it? Don't think I will
> send it to a CLA because of the low worth.
>
> Any helpful comments are welcome.
>
> Bernd Möller
>
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