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Gday Mark,
I own a set of Antlia 4.5 filters which iv had no probs with so far. Im a newbie to astrophotography and these are my first and only NB filters iv had so i cant make any comparisons.
Another thing to consider is maybe going 36mm filters. If you ever decide to get a camera with a larger sensor you would be future proofing yourself a bit.
Cheers,
Adam
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