Lenses do sometimes "wear out" -- mostly, the helicoids get sloppy with
wear, and occasionally there is a lever in the aperture mechanism of
some models that wears to the point that the aperture jams closed
sometimes. But the biggest "killer" is fungus -- and water and impact,
of course. We can sometimes clean fungus, but not always. A little
debris isn't a crisis, except that I suspect that's where fungus starts
growing. If you keep it otherwise clean and dry, you should be OK. If
you live in a humid environment, I'd consider having a dirty lens
cleaned.
plp@xxxxxxxx wrote:
> Since we're having all of these threads on repairs, I have to
> ask how often lenses need service. Some situations are obvious,
> like the aperture ring stops turning. But what about regular
> wear and tear? Is it a good idea to have a lens CLRed if 'x'
> particles of dust are inside it? (and what is 'x'?) Since my
> lenses may have to last forever, as used ones will be of lower
> and lower quality as time goes on, I cannot afford to have one
> destroyed by fungus.
>
> Pete
>
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