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I think that's a good call Bert. I use 5nm Ha and with my CDK17 I find I get moon effects still. Also a bright spot but thats the CDK style optics.
3nm Ha no doubt would go a long way to rectifying that. But as the article points out you would need the N11 to make up for the lost signal.
If you are imaging from a light polluted location 3nm Ha makes a lot of sense with fast optics that make up for the increased exposure time needed with 3nm.
Greg.
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