Scooterman wrote:
> but how in the world does
> one get crud INSIDE of a sealed unit??
Lenses aren't sealed. They have to be vented to allow for expansion
of air and movement of internal workings.
> Is this something I need to be worried about?
Generally not. In fact, I've seen some lenses with huge spots of dirt
or dust in them, but when I've taken them apart they are minuscule.
They only seemed large because the optics magnified their size.
> How can ya prevent this from happening?
Hermetically seal the lens and never use it.
> How do ya "fix" it once it happens
> (or is that why this stuff is for sale)?
Depends - sometimes, if you're compulsive, and the lens is worth it, a
professional CLA is a good choice. In other instances a lens may be
easy to take apart to one degree or another, and you can do a pretty
good job yourself without screwing anything up. However, most of the
time the small amount of dust inside a lens has absolutely no effect
on the quality of the photograph, and it's just as well to leave it
alone.
I mentioned the few bits of dust in the lens I'm offering because I
want potential buyers to be absolutely clear about what they are
getting. For some a speck of dust is a heart stopping experience, for
others it's just part of life. Even brand new lenses can be found
with dust specks inside, so buying new is no guarantee of pristine
condition.
--
Shel Belinkoff
mailto:[EMAIL PROTECTED]
"Why should I use a meter? What if the darn thing broke on me
when I was out making a photograph? Then what would I do?"
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