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Hi Mary,
You must be using an SLR with a removable lens? You probably have some dust on the inner glass of your lens or on the mirror inside the camera. You can take it to a camera shop to clean it, or you can use a blower to blow the dust off the mirror, but it's extremely fragile, so I wouldn't do it if you're not sure about it. Or do you have a filter (daylight or other) on your lens? You could have some dust between that and the lens. I like to keep a daylight filter (essentially another piece of glass) screwed on the lens to protect it, particularly when it's used outside.
Holly
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