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John, aside from it possibly being a focus issue, it will probably be the seeing conditions were below average at the time you shot these. The best results are obtained by shooting video footage which allows thousands of captured frames to be quality sorted in Pipp. You capture the footage in programs such as Backyard Eos/Nikon or Sharpcap. As long as your camera is supported by the software. Some use whatever you see in Liveview, which means you can enlarge the image by pressing your magnifying button on the camera, such as you do when you require critical focus. You then have many of the best frames to stack.
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