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Update 30/08/2018
Hi all,
I braved the Full Moon and acquired about 20 hours of NII data of the Helix when it was positioned on the sky quite close to the moon. I will need to carefully calibrate with flats and remove gradient from the Moon glow, and the data is not as clean as Ha or OIII that were captured during darker nights, but nonetheless NII seems to be a bit different from Ha and I look forward to combining all three channels into one image of the Helix.
Attached are histogram stretches of NII (left) and Ha (right).
Thank you for following my progress with this project.
Suavi
EDIT: I am wondering whether similarities between the Ha and NII is due Ha signal leaking into NII and NII into Ha even with 3nm filters...
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