This is an image of IC 405 Flaming Star Nebula, one of the commonly imaged gorgeous nebula.
I image in bortle 9 sky in the city of Seoul, so Oiii signals are buried under the heavy light pollution.
All the more, this target have very faint Oiii signal anyway, so I decided to use 3nm Nii filter instead.
Because of the close proximity of Nii and Ha emission lines, the 3nm filters actually transmit some of the each, so they usually result in very similar looking images.
However, there are enough differences so that you can create decent images out of them.
This image was created using Sii, Nii and Ha filters, and uniquely combined into a SNH color palette.
But simply assigning Sii, Nii, and Ha signals to R/G/B gave very unbalanced image due to large variation in the signal strength of each emission line
So I had to use a color combination method called Foraxx combination, which balanced out the channels more.
The stars were imaged with R/G/B filters separately, and was added to the starless image of the nebula.
I don't think anyone has tried or readily image in Nii emission line, so I welcome any questions you might have about the image.
I also made a Youtube video about Nii emission line, so feel free to check it out!
https://youtu.be/CLPeAsEGqrA?si=7_GbKas_lMmq8k-T
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