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Old August 20th, 2009, 09:59 AM   #1
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Dust internally on Kit Lens 24-105mm

Just noticed a fairly large piece of dust on one of the rear internal lens elements on the Canon Zoom Lens EF 24-105mm L IS USM after reviewing some video footage. It was noticeable when shooting the sky. Ran some tests and it presents a issue when shooting at F 8 and above. Not visible when shooting under F 8.

Has anyone had issues with this lens with dust getting inside the lens?

I am wondering if the zoom extension of the front tube is pulling in any dust that may collect on it when using the zoom, when it extends out and in?

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Steve
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Old August 20th, 2009, 11:30 AM   #2
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Have Canon fix it, assuming you are under warranty. If you are not, I would still get it fixed, that isn't a cheapo lens.

Dan
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Old August 21st, 2009, 09:45 AM   #3
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Hi Steve,

You need to double check maybe dust in sensor. Change another the lens and if you still see a issue, for sure your camera have dust in sensor.

Cuong Dinh
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Old August 21st, 2009, 04:50 PM   #4
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Yeah, I would definitely double check to make sure it's really the lens and not the sensor; I don't think it's common for dust in the lens to show up. If you haven't already done this, use the same body with a different lens or two at small f stops, to make sure it's not sensor dust you're seeing.
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Old August 22nd, 2009, 02:43 PM   #5
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I can see a spec of something in the internal lens.
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Steve
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Old August 22nd, 2009, 07:19 PM   #6
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Quote:
Originally Posted by Steve Cahill View Post
I can see a spec of something in the internal lens.
I'm sure that's true, but it doesn't rule out sensor dust. In fact, sensor dust is still a far more likely cause of your issue.

Take a test shot with a different lens.
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Old August 22nd, 2009, 07:22 PM   #7
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Dear Steve,

You may be able to get the speck of dust, in the lens, if it is actually there, to move.

Sometimes you can get it to move to the side, out of the way.
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Old August 23rd, 2009, 09:10 PM   #8
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I'm sure that's true, but it doesn't rule out sensor dust. In fact, sensor dust is still a far more likely cause of your issue.

Take a test shot with a different lens.
Right. I can see dust in most of my lenses, but it never shows in my photos. If you want to know for sure where the problem is, try different lenses, since sensor dust is a problem far more often than lens dust (in my experience anyway).
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Old August 24th, 2009, 12:00 AM   #9
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If it goes away at lower f-stop settings, it is likely not sensor dust.
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Old August 24th, 2009, 12:39 AM   #10
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If it goes away at lower f-stop settings, it is likely not sensor dust.
That is not correct. It is normal for sensor dust to go away at lower (wider) f-stop settings.
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Old August 24th, 2009, 05:08 PM   #11
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How would sensor dust go out of focus when the iris changes?
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Old August 24th, 2009, 05:38 PM   #12
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How would sensor dust go out of focus when the iris changes?
Same reason that you have a shadow in sunlight and no shadow in overcast. The filters on top of the sensor can be as thick as 2.5mm. At wide f-numbers, the light is "soft", coming from many angles, causing the dust particle to cast a large, diffuse shadow, resulting in a very tiny reduction in contrast over many pixels. At narrow f-numbers, the light is "hard", coming from just one direction, and therefore casting a dark shadow on one small spot.
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Old August 24th, 2009, 10:29 PM   #13
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"The filters on top of the sensor can be as thick as 2.5mm."

That is something I didn't know. There is a lot to learn when shifting from a video camera with integrated lens to a still camera with interchangeable lenses.
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