Unless the you put up the picture for review, its hard to speculate on excess noise. If you can, add you picture in concern here and you will have better response.
In short, if you decrease you ISO by choosing a wider F or longer shutter time, you will have much less noise but then the sensor in your camera is excellent and ISO 1000 should not be a problem. In fact 3200 or even 6400 should be relatively noise free. This holds good, even with most other newer cameras that do not have as good a sensor as yours.
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S a s s a n .
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