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No. It will do any subject. It just plonks each frame on top of the last and picks the brightest pixel to show through. For most things it just makes a mess but since the bright stars move across a dark background it will create a star trail.
My point was that it won't give the opportunity to save a file until you've opened a series of images and done one of the functions in the Build menu. If you click save before then, nothing happens.
Hope that helps.
Steve.
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