This video shows how to blend multiple images of stars with Starry Landscape Stacker to reduce noise.
Starry Landscape Stacker is for Macs only, but Windows users can use Sequator, which does essentially the same thing. With either program, the most important part of the process is what you do in Lightroom or Camera Raw before blending the images together, and this video covers those steps in detail before showing the steps specific to Starry Landscape Stacker.
And to learn more about processing landscape photographs, including nighttime images, please check out my two Lightroom courses.
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