Thread: OIII filters - which is the best
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Old 25-09-2005, 06:57 AM
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square_peg114GT
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Location: Maple Valley, WA, USA
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Spectral analysis on this website shows that the Lumicon is focused more narrowly on the 2 desired O-III lines than the Astronomik or Televue O-III filters. The new Orion O-III filter is purported to be weak at the 501nm line.
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