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Old Jun 11, 2005, 8:48 AM   #1
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Hi all,

Iam a newbie to SLR ... Bought a second hand lens Canon 28-135 IS USM (supposedly hardly used and less than a year old).
After I downloaded pictures from the camera I noticed a little dark and blurry patch on every photo taken with this lens. I checked the front and the rear elements... all clean. Then I inspected the lens more thoroughly and to my surprise I discovered specks of dust on all elements inside the lens... and a little white mite crawling under the glass! What the heck! Now I am reluctant to put that lens onto my new EOS 350D ... How do I get rid of the mite and the dust? Should I have my lens disassembled and cleaned by a photo technician?

Also zoom operation is not smooth between 50 and 70mm. Is it normal for this lens?

Thanks
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Old Jun 11, 2005, 9:04 AM   #2
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maros wrote:
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... zoom operation is not smooth between 50 and 70mm. Is it normal for this lens?
This is normal - if you notice several elements move at the same time when this happens
(the front of the lens moves out while the middle part moves back!)

... also normally specks in the lens should not show up on the pictures - Are you sure it's not dust on the sensor instead?
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Old Jun 11, 2005, 12:11 PM   #3
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To test for dust on the camera's image sensor, take a different lens you think is clean. Set the aperture to f22 or so, and take a picture of a blue sky. if there are dark blobs on the picture that is most likely dust on your sensor.

But the mite in the lens might do it too.

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Old Jun 11, 2005, 3:47 PM   #4
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if it's a new rebel xt, I don't think it will have dust on the sensor- unless you're really trying to put dust in it.

I've heard a few people saying to just forget the lens if there's something wrong inside. If there's hope, then it has to be with canon where they may be able to open it up. I doubt anyone else can be able to fix it.
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Old Jun 11, 2005, 7:03 PM   #5
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I am pretty sure that the sensor is clean. It is a brand new camera (just a couple of days old) and the specks do not appear on the pictures when using other lenses... even when closed down to F22 or higher and at any focal lenght.

Must be the mite(s) and the dust on the rear elements.
Will try to contact Canon... but is it really so unusual to disassemble lenses and clean them? Returnig the lens might be another option...
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Old Jun 11, 2005, 10:03 PM   #6
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i think you might be better off returning it then. The hassles you'll have to go through will probably not justify how much you paid for the lens in the first place
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