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Old Dec 12, 2005, 6:25 PM   #1
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How much will a spec of dust affect a lens? I got a new lens and there is one little spec under the first piece of glass. It looks like it is on the outside of the lens but when you take a brush to it, it doesn't move and you can tell it's underneath.



The lens is like 2 days old. Is this something I should return it and get a new one for?
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Old Dec 13, 2005, 11:35 AM   #2
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2 days old? hummmmmm.....One little speck probably wont show but if your like me, it will drive you nuts just knowing its there...Send it back to be replaced or cleaned....
Don't need the speck on your mind when your creating that masterpiece...
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Old Dec 13, 2005, 8:39 PM   #3
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Well I just spotted a HUGE piece near the back of the lens that shows up as a shadow about the size of a 5% spot, so I am taking it back this weekend.
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Old Dec 14, 2005, 4:57 AM   #4
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Do you mean it shows up in the photos? If so, then absolutely, take it back.

The other day there was a large dark spot showing up in my pictures, and I thought a hair had somehow found its way onto the sensor! Then I noticed it went away when I changed lenses. Turned out it was a strand of dust on the rear element of the lens-- thankfully on the outside and easily removed with a blower!

Out of curiousity, what kind of lens is this?
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Old Dec 16, 2005, 9:58 AM   #5
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17-85 EF-S, and yes I mean it shows up on the picture. Taking it back today.
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Old Dec 16, 2005, 2:53 PM   #6
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small specs of dust are in all lenses.. i have never seen one big enough to show up in a picture since it is so far out the focal plane.... take a pic with another lens make sure its not sensor dust you are seeing..
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Old Dec 18, 2005, 6:35 AM   #7
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You are almost certainly are seeing sensor dust changing the lens most likely pointless because:

1. Dust in the lens won't be showing in your photos.
2. A dustless lens fresh from the factory will soon get some dust in it because the zoom action acts like a bellows moving air and dust in and out as you change the focal length.
3. You will still have dust on your sensor which will continue to show up in your photos until you clean the sensor.
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