adjust the noise reduction when you are working with raw files. Again when shooting in raw the camera does not do any noise reduction like it would with a jpeg.
Using a long exposure do not necessarliy mean over exposure. It just depends on the scene. In this scene if you use a ND grad filter to darken up the sky you will be able to expose the ground more.
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Rex K
The view from my "office" doesn't suck. 
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