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That looks fabulous.
I imagine I would take 2 lots of images. One short for the stars and autoguided, the other longer of the comet and I guess you'd have to autoguide on the comet itself as the guide star if you could in order for it not to blur. Or take as long an image you could of the comet before it moves too much and take lots of them and stack them.
Then in Photoshop you would delete all the stars in the comet long exposure and then add the stars image as a layer in lighten mode the stars would shine through. You probably would have to delete the blurred comet out of the stars image with the clone tool and clean any leftovers with the healing tool.
That would work.
Greg.
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