Great techniques for low-light astrophotography
Adam Woodworth
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Exposure blending
This is a method of combining multiple photographs taken at different settings together in software to create a perfectly exposed final image. Photographs captured with the settings needed for pinpoint stars often result in a very dark and out-of-focus foreground. Separate shots with settings appropriate for the foreground can be captured then blended with the sky shots, to make a final image that has plenty of detail in both the sky and the foreground.