Thread: 5nm vs 3nm Ha Filters- the NII question
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Old 27-07-2016, 10:55 AM
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RickS (Rick)
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Join Date: Apr 2010
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I went with 3nm Ha and the only time I regretted it was on the Helix. The 3nm filter is bulletproof when it comes to imaging under moonlight!

Cheers,
Rick.
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