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I'd better stop "shooting from the hip". In 2007 I said:-
"It had an interesting effect on Eta Carina - it went deep red. For fun, I turned the scope on Antares which was also a deep red colour."
I think that might make more sense than violet?
Time to have another careful look. Of course, apart from using a star to refocus with the filter in place, one is too busy looking at the enhanced nebula to pay careful attention to the stars!
Edit: Spotted some more on CN:-
"Yes, the NPB does yield small secondary red flarings on bright objects, but it does so at a level which is less than that seen with my Lumicon UHCs." David W. Knisely
Last edited by erick; 10-08-2009 at 03:43 PM.
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