I was using a Canyon 5D. You apparently missed AG's reply where he was
gloating over his E1's apparent immunity to dust. I would guess that I
have to clean the 5D about every 6-9 months. In this case I cleaned the
camera just before we left upstate New York on our trip and the first
indication of dust is on on the coast of Northern California at Point
Lobos. That's actually several hundred frames earlier than I thought it
was just a while ago as the spot is just a wispy gray and is difficult
to see unless it's on a patch of clear blue sky. That also means there
really aren't too many frames where I'll actually have to despot the dust.
The Olympus sensor is not in a sealed dust proof environment. It
vibrates at ultrasonic frequencies on power up to shake the dust off the
sensor. Then the dust is captured by a sticky strip of something as it
falls off the sensor. Canon and others have since imitated the process
with more or less success. Canon has also added software dust mapping
and spot healing which is what was referred to in my reply to AG and the
link to the Canon page on dealing with dust. I don't have any idea how
well that stuff works but I have not found dust cleaning to be an
onerous task... at least not until now. I wouldn't normally have shot a
couple thousand images without checking the sensor but it was something
that was all too easy to forget when traveling.
Chuck Norcutt
John Hudson wrote:
> Chuck ...........
>
> I'm sure there will be other listees who will express their gratitude to you
> for posting this message; I certainly do.
>
> What camera were you using on your long trip?
>
> If it was an Olympus E series camera was your dust problem an unfortunate
> one-off or perhaps indicative of what can, and likely will, happen after
> prolonged usage despite Olympus having its own technology that supposedly
> keeps the sensor in a sealed dust proof environment?
>
> jh
>
>
> ----- Original Message -----
> From: "Chuck Norcutt" <chucknorcutt@xxxxxxxxxxxxxxxx>
> To: "Olympus mail list" <olympus@xxxxxxxxxxxxxxxxx>
> Sent: Thursday, November 20, 2008 4:00 PM
> Subject: [OM] An amazing discovery... well, to me anyhow
>
>
>> While perusing my 3500 photos taken during my long trip around the
>> country I was dismayed to discover that the camera had picked up a faint
>> dust spot about half way through the journey. Not readily visible
>> except in clear blue skies but, of course, what was I shooting but
>> mostly landscapes with clear blue skies. Anyhow, I have been dreading
>> going through the last half of the shots.
>>
>> Purely by accident I was trolling through some stuff on Canyon's web
>> site about dust removal which I thought was going to be totally camera
>> related. The camera related stuff was not particularly useful but then
>> I stumbled across this gem. Click on the link below and scroll down to
>> "Dust Mapping" and "With Adobe Software" below it.
>> <http://www.usa.canon.com/dlc/controller?act=GetArticleAct&articleID=1446&fromTips=1>
>>
>> I have only recently started doing identical exposure and related
>> adjustments across multiple images in Camera Raw using the "Select" and
>> "Synchronize" options. For unknown reasons I have never attempted to
>> use any retouching tools in Camera Raw nor did I realize that they could
>> also be the subject of "synchronization" across multiple images.
>> Furthermore it never occurred to me that any form of "retouching" would
>> be useful across images. But, as it turns out, it certainly is useful
>> for cloning out or healing dust spots. Pay particular attention to the
>> admonition to allow the software to choose the healing source. That
>> again is a capability I didn't know existed.
>>
>> I still hate to think of possibly having to dust spot hundreds of photos
>> but this should make it go a whole lot faster. I'll also remember from
>> now on to recheck the camera for dust from time to time whenever I'm on
>> a lenthy trip shooting thousands of images. I cleaned the camera before
>> I left. I even took my cleaning gear. But it doesn't help if you don't
>> spot check once in a while and clean as required.
>>
>> Chuck Norcutt
>> --
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>>
>
>
>
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