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Somehow, from the results of the Triad Ultra Quad NB, I still feel it's rather strongly Ha dominated, so I don't know who much "better" it is than the STC DuoNB (which I have).
Recently I've been more keen on the IDAS NB2-PM and NB3-PM. I'm thinking of using these two instead to combine to get a little more Oiii control in the final image.
Here's a sample NB3-PM which I took last week of the Helix Nebula (total of 3 hrs of 10 min subs - taken at ISO 2000 via my CentralDS cooled Astro A7S, through my Takahashi µ250CRS).
P.S. and a single 5 min sub of the NB2-PM. Waiting for the moon to go bye bye to take more subs for the NB2-PM before final combination.
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