Imaged the North American Nebula (NGC 7000) using two narrowband filters (Ha/OIII and SII/OIII) over the course of eight nights in October/November 2021. Final image combines data from the two filters using the SHO pallette.
Imaged with Astrotech AT60 at F4.8 (288 mm focal length) using Astrotech ATRF60 field flattener/0.8x reducer, Optolong L-Enhance dual narrowband filter (for Ha and OIII) and IDAS NB3 dual narrowband filter (for SII & OIII), and full spectrum modified Nikon D5300 . Total integration time of ~7 hours for each filter:
Ha/OIII: 83 subs at ISO400 x 300 se.
SII/OIII: 82 subs at ISO400 x 300 sec
Starting with individually processed Ha, OIII, and SII images generated the SHO image using the following steps in PI:
(1) Used Linearfit to equalize the images (using Ha as the reference).
(2) Used the SHO-AIP script to generate the SHO image (Ha for luminance, R=SII, G=Ha, B=OIII).
(3) Reduced the magenta tone of the stars using the following steps: Inverted image, applied SCRN process (set to Green), inverted image again.
(4) Tweaked the color palette from gree
n dominated to more orange dominated by first using Curves Transformation in Hue mode followed by SCNR to remove green.
(5) Color saturation boost
Original version = SHO pallette image
Rev B = SHO image further processed using Topaz Denoise AI software
Rev C = starless SHO image
HOO version/Ha&OIII images:
https://astrob.in/t1f0v6/D/
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