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Dirt on the inside of the front lense

Hello, I have a efs 17-85 canon lens but there is a little bit f dirt on the inside of the front lens. Its fine when photographing most things but I am photographing snow and against that they are very visible. Is there a way of opening the lens up to clean?
thank you neville

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Hello, I very much doubt that a small piece of dirt on the lens is a problem. It is more likely that your sensor needs to be cleaned. Sensor dirt is more visible at small (f11 to f32) apertures. I expect that you are shooting bright snow with a small aperture & this is why you are seeing the problem. To check, try the following.
Set camera to Av, ISO 100.
take some photos of the sky, a blank wall, or some other featureless surface, as follows:
1 - Set aperture to highest possible f - number.
2 - set aperture to lowest f-number.
3 - repeat 1 with a different lens
4 - repeat 2 with a different lens.

I expect that you will see photo 1 and photo 3 will have identical smudges of dirt on them. Photos 2 and 4 should have no smudges. If this is the case, your problem is dirt on the camera sensor. The only way to fix it is to clean your sensor.

Posted on Jan 08, 2009

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