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Re: [OM] dust in the lens

Subject: Re: [OM] dust in the lens
From: Garth Wood <garth@xxxxxxxxxxxxxxx>
Date: Fri, 02 Nov 2001 10:16:18 -0700
At 10:25 PM 01/11/2001 -0800, you 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?

Lenses are open tubes, generally (this allows them to change their length in focusing operations). As you move the tube back and forth during focusing, air gets sucked in or blown out, and with it, dust. The only exception to this are "internal focusing" lenses, which still have moving tubes, but are enclosed in an outer tube of fixed length (so it can be 'completely' sealed). Even with sealed tubes, there are still mechanical linkages which allow small quantities of dust in over long periods of time.

The dust is generally harmless, although large quantities of it can lower contrast significantly. The dust particles do not resolve in the image.

Garth


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