Quote:
Originally Posted by Atmos
It's still a pretty good image 
Where running at ISO400 helps over ISO1600 is being able to process the light and dark areas. The higher the ISO the mor compressed the dynamic range becomes.
A lot of people image at ISO1600, stacking more images increases the dynamic range and if there are blown out areas you can always take some shorter exposures to bring them down.
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Is there any more to the process than just taking a few lights and corresponding darks at a different ISO, and chucking them all in to be stacked together? Is there a certain setting in DSS that will lend itself to different exposures?