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Choosing filters
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15-07-2011, 07:16 PM
Bassnut
(Fred)
Narrowfield rules!
Join Date: Nov 2006
Location: Torquay
Posts: 5,064
Very narrow band filters (<5nm) are marginal for fast (<f4) optics due to the steep light cone (frequency shift). I have used 3nm on f6.7 and its fine. Narrow filter BW from any manuf wont be a problem at f6.3 and up.
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