Filter to Counter Aberration
Baader Planetarium makes a Fringe Killer https://amzn.to/2Srnzlf which I have heard good things about, they also make one called the Semi-APO https://amzn.to/2VmXmGi which has had some good reviews. Keep in mind that any filter's performance will depend heavily on your particular scope and eyes. What may work for one person may be terrible for another. Just make sure you order the filters from some place with an excellent return policy and give them a try.
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