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[OM] Re: E1 ultrasonic sensor dust removal

Subject: [OM] Re: E1 ultrasonic sensor dust removal
From: Winsor Crosby <wincros@xxxxxxxxxxx>
Date: Wed, 28 Jul 2004 07:23:55 -0700
Have you checked? You don't really see much with ordinary exposures. 
Take a picture of a clear sky with a very small aperture like F22. Load 
it into Photoshop and use levels to increase the contrast. You will be 
amazed.



Winsor
Long Beach, California
USA
On Jul 28, 2004, at 6:57 AM, W Shumaker wrote:

> I don't have enough data yet to know. Eventually there is something
> that collects the dust that will have to be replaced, and it may take
> a few years before that happens. I change lenses all the time, use the
> OM adapter, extension tube, etc. But I'm also paranoid, change lenses
> quickly and try to be careful. Even so, looking in I can see dust 
> particles
> on the mirror, but none in my images, yet.
>
> I always wonder about the 50-200 zoom, zooming out the lens
> has to suck in a lot air, like a pump.
>
> Wayne
>
> At 08:24 AM 7/28/2004, Matt asked:
>
>> How well does the ultrasonic dust removal scheme work? I was 
>> discussing
>> the E1 with a colleague today, and it got me thinking about it.
>
>
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