Most eleement groups/assemblies are airtight EXCEPT the 2 glass surfaces on
either side of the diaphragm blades. Dust enters through the rear of the
lens where the coupling rings make their way to the diaphragm mechanism.
John
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----- Original Message -----
From: <WKato@xxxxxxx>
To: <olympus@xxxxxxxxxxxxxxx>
Sent: Thursday, September 16, 1999 11:15 AM
Subject: Re: [OM] ...dirt inside lenses...
> In a message dated 99-09-16 10:24:49 EDT, you write:
>
> > I notice dirt inside some of my lenses. 24/f2.8 in particular. How did
it
> > get in there ? and how to get it out? Does this mean that the lens
isn't
> > airtight ? Are lenses supposed to be airtight in the first place ?
>
> Dust can get into the lens by the action of focusing it--the extended lens
> acts like a bellows and sucks air in and out.
>
> > I also see some kind of real tiny little bug ( with legs) sometimes
> crawling
> > around inside too.... Now how to evict these tenants ?
>
> Mites. They will eat the dust and leave droppings. I would suggest storing
> the lens in an airtight container with a dessicant (not calcium chlorine
> because its dusty) and maybe the little guys will dry out.
> >
> > Also got a speck of 'spider web' looking fungus growing inside my
35-105
> > zoom... how to clean it away ? Or should I just leave it there ? Its
been
> > years now, I've noticed the patch doesn't grow in size .(phew..)
>
> Periodic exposure to good old sunlight with ultraviolet light should stop
it
> in its tracks. Also this lens should be stored with dessicant. I live,
> fortunately, in Southern California, where there's low humidity but where
> landscapes turn out brown due to the smog.
>
> Warren
>
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