This is another image using the rare Nii filter.
IC417 and NGC1931 both have very weak Oiii signals, which cannot be imaged in the heavily light-polluted city sky.
So instead of trying to get something out in the Oiii, I used Nii filter instead.
(I've made a Youtube video about Nii emission line, so feel free to check it out if you are interested!!
https://youtu.be/CLPeAsEGqrA?si=7_GbKas_lMmq8k-T)
I've combined Sii, Nii, and Ha, and used Foraxx combination to balance out the channels.
I think this gives nice blue colors that are usually not present in the natural color images, and mild pinkish tints, which I really like on my images.
The stars were imaged separately using RGB filters, and combined into the SNH-Foraxx starless image to give the natural colors to the stars.
Total integration time of this image is about 22 hours.
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