Re: [OM] ( OM ) Dust and other foreign bodies in lenses - follow-up.

[Tom]

If the lens changes size, air has to go in & out.

Tom

On Saturday, June 15, 2002 at 8:52, Brian Swale <olympus@xxxxxxxxxxxxxxx>
wrote re "[OM] ( OM ) Dust and other foreign " saying:

> Hi folk,
> 
> It's not just zoom lenses (push-pull zoom or not) that behave this way.
> 
> Many / most macro lenses have a lot of helicoid travel and therefore there is 
> a lot of air displacement during use. Lenses that focus close may in some 
> instances have the same larger movements (eg 90, 100 f/2).
--
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