The claim: The Radian Triad Ultra Quad-Band Narrowband Filter is the only filter you will need for narrowband imaging, especially under light pollution.
Big claim … big price. But does this filter live up to the hype?
Woah, over a thousand Euros but reviews seem good. If you have OSC still cheaper than going Mono just to avoid LP. I get great images with my OSC but it falls down when in LP at home or with a moon up - even with a CLS-CCD filter. I had high hopes for the CCD filter but just doesn't cut it.
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.