Celestial hemisphere:  Northern  ·  Constellation: Cepheus (Cep)
Cave Nebula, all combinations of H-Alpha, OIII and SII, Albert van Duin

Cave Nebula, all combinations of H-Alpha, OIII and SII

Cave Nebula, all combinations of H-Alpha, OIII and SII, Albert van Duin

Cave Nebula, all combinations of H-Alpha, OIII and SII

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While processing this image, I tried all combinations and was surprised by the variation in colours.
Which one do you like best?

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Cave Nebula, all combinations of H-Alpha, OIII and SII, Albert van Duin