Quote:
Originally Posted by Paul Haese
Rick this is done with my soon to be retired astronomiks which are at 12nm I think. I can never remember if they are 12 or 13nm. These are being replaced with a set of Astrodons with the Ha and SII being at 5nm and the OIII at 3nm.
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Good choice, Paul. I have all 3nm Astrodons which is great for light polluted skies... except for slow focal ratios combined with targets which have a lot of NII. I'm certainly struggling on the Helix at f/9 with my 3nm Ha filter. 18 hours of data and it's still quite noisy in the dimmer areas.
With luck the new filters will get rid of your halos on some of the bright stars. Only a minor thing but I'm sure you won't miss them.
Cheers,
Rick.