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Old 19-12-2012, 11:37 AM
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multiweb (Marc)
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multiweb is offline
Join Date: Oct 2007
Location: Hinchinbrook
Posts: 18,327
Originally Posted by Bassnut View Post
At f2, you can forget 3nm NB filters
I heard about the light cone being too steep for NB filters to work properly due to the angle of incidence on the glass surface but I haven't seen anything different with my 7nm Ha. Don't have a 3nm set. They're too bloody dear.
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