Thread: 5nm vs 3nm Ha Filters- the NII question
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Old 05-08-2016, 07:42 AM
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Merlin66 (Ken)
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Join Date: Oct 2005
Location: Junortoun Vic
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We regularly use a combination of a 10A (0.1nm) ITF (induced transmission filter) and a 0.3A (0.03nm) etalon to give a very narrow band Ha filter.
OK for solar but NBG for deep sky stuff.
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