In order to minimise noise, particularly when using higher ISO, it is important to expose to the right. Also, when doing this please remember to shoot in RAW so you can adjust your exposure easily in your RAW conversion software. Simply look at the histogram and make sure it is biased to the right, although not so far to the right so as to blow the highlights though. Doing this will minimise noise. Of course when you look at the pictures on your computer they may seem a little light. Simply adjust the picture with the sliders in your editing software to get it looking right. Remember, the point of this is to minimise noise.
Normally the above histogram would indicate a well exposed shot. When exposing to the right you will adjust your exposure to get something more like the histogram below.
You can find out more at:
http://www.luminous-landscape.com/tutorials/expose-right.shtml
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