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Determining narrowband filter target suitability.
Just wondering what resources there are for determining the suitability of a particular narrowband filter for a specific target. Not really worried about reflection/emission nebulae, plenty of info around for many of them, but more for other DSO like galaxies & planetary nebulae.
I'm currently doing HaRGB while saving for better gear, and when the moon's around I shoot my Ha. But I don't want to waste my time shooting hours of Ha that won't get much more detail than just using a luminance filter. I'd rather spend that time on something more worthwhile.
TIA
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