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Nice shot Brian. If you filter an achro, say with a red filter, you'll get rid of any CA. That's how they did it in the old days. These days, you can just pull the red channel out of the digital image. Do that and the fringe disappears.
One thing about your pic confuses me. You say it's prime focus of your 5"f8 refractor and 1/4s ISO 400. Intuitively, that seems much too long an exposure for that optical train and ISO. Are you sure it wasn't 1/400s?
cheers
Joe
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