The 2 surfaces facing the diaphragm, especially, are not sealed. The
diaphragm mechanism must interconnect with the control levers on the back of
the lens, so there are channels letting dust, moisture, etc. in.
John Hermanson
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----- Original Message -----
From: <clintonr@xxxxxxxxxxxxxxxx>
To: <olympus@xxxxxxxxxxxxxxx>
Sent: Friday, November 02, 2001 11:31 AM
Subject: Re: [OM] dust in the lens
| Actually, very few lenses are "sealed" -- there's lots of openings for
external
| debris to gain entry between groups. And even for those elements that are
| "ganged" into self-contained groups that _are_ more or less "sealed",
there's
| often anti-reflecting paint here and there that can flake off between
elements.
|
| All in all, though, there's got to be alot of "stuff" there to affect your
| images. Just be wary of fungus -- it sometimes seems to grow around
debris on
| the elements.
|
| Richard F. Man wrote:
|
| > So how do dust get into the (older) lens? I can see fungus growing due
to
| > moisture content, but dust? Or may be they are paint and whatnot from
the
| > interior of the lens?
| >
| > // richard http://www.imagecraft.com
| > [ For technical support, please include all previous replies in your
msgs. ]
| >
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| > < For questions, mailto:owner-olympus@xxxxxxxxxxxxxxx >
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|
|
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