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That came out reasonably well. Good work.
Comets are fairly broadband in the spectrum even though they look green. There are specific "swan bands" to identify certain gasses - mostly greenish. Narrow filters like the OIII don't help much photographically. Lumicon used to make a swan band comet filter but it was for visual use. They recommend the deep sky filter for comet photography, if a filter is used at all.
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