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Old March 28th, 2004, 04:18 AM   #1
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Digital Rebel Dust Problem

Hey guys, I'm currently in Amsterdam and far, far away from my Digital Rebel manual, but I'm having a particular problem someone here might have a clue about. I've got the standard kit lens and a Canon 28-135 EF lens for the rebel, and yesterday a 'smudge' started appearing in the left hand side of images taken with a high (20-22 or so) aperature setting. It's not very big, maybe 20 pixels across, just enough to darken the image so you can spot it on a photo of the sky, or something else light and smooth. It's noticable on the preview lcd, but not in the viewfinder, and it shows up with both lenses, which makes me think that it's something in the sensor. I just took some shots of the white on the left of the posting page from 22 down to 5.6, and it shows up in all of them, but gets less and less visible as the aperature drops and the shutter speed increases. Thoughts? Also, if it's the sensor, any suggestions on the best way to clean it?
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Old March 28th, 2004, 07:47 AM   #2
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I think the problem's been resolved. I found the rebel manual online, and picked up a lens cleaning kit with a plastic blower with removable brush for 5.95 euro, and a quick few puffs later it seems to be back to it's good old pure self.
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Old March 28th, 2004, 07:54 AM   #3
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You are correct, it's dust on the sensor. By stopping down the lens, you increased DOF and the dust became sharper and more noticeable. Just use the blower and you should be fine. Try to avoid touching the sensor (CMOS chip) if at all possible. I've heard horror stories of it getting scratched very easily.
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Old March 28th, 2004, 10:45 PM   #4
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Thats a fairly common problem with DSLR's--you will find that the sensor is like a dust magnet and depending upon the enviornment you work in, could need frequent cleanings. I would stay away from standard cleaners--the consensus among the pros is to use Eclipse fluid applied with a pec pad wrapped in a spatula---
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Old March 29th, 2004, 07:26 AM   #5
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"--the consensus among the pros is to use Eclipse fluid applied with a pec pad wrapped in a spatula---"

An interesting point, for which I am awaiting a translation...
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Old March 29th, 2004, 06:22 PM   #6
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Sorry---this kind of sums it up:

http://www.pbase.com/copperhill/ccd_cleaning

It works very well and is relatively safe---in other words people have been using this combo for quite awhile with no problems.
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Old April 14th, 2004, 02:08 PM   #7
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Nice site, boy am I glad I have an sealed system (Olympus E-1). It also keeps me from buying expensive lenses.
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