This image was taken with an H-alpha filter to capture the background clouds, but the subject of the image is NGC 6910, the cluster of stars in the middle. Sometimes it is called the Rockinghorse Cluster, and it does suggest that shape when viewed from the top right corner of the image (that is, from the northwest).
This image is 9x1200" with the SXVF-H9 through the Synta-ONTC8 at f/4.95 and an Astronomik 6nm H-alpha filter.
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