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I'm a nikon guy myself but i know there are a bunch of inbody-drop in filters available for canon. I think there are ones suitable for modified or unmodified cameras, so read up on the details. Remember a filter blocks some light so expect to need to increase exposure time and/or stretch further in processing, but with a filter you are gathering more usable signal and dont need to remove as much colour cast later on in processing. Highly worthwhile getting one. If you have a choice of brands I'd be inclined to research but likely go with the expensive option, not just the cheapest i find on ebay. A poor quality (cheap) filter may be removing more than just light pollution and/or introducing chromatic problems. With optics the extra cost for quality is worthwhile.
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