D7000 Got dark spots from long time exposure 3s-30s

Started May 14, 2011 | Discussions thread
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photos518 New Member • Posts: 10
D7000 Got dark spots from long time exposure 3s-30s

I took some night pictures today at shutter speed from 3s to 30s. I just noticed that there are four dark spots on the right edge of image. I tried two lenses and the dark spots happened to be at the same place. Thus I don't think it is on the lens. Can anyone tell me what they are? Is there anything wrong with the sensor or just some dust on the sensor?

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