NGC281 Pacman Nebula in SHO and RGB

 Posted: Oct 12th, 2025
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NGC
IC
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Technical Info
Telescope/Lens: Askar FRA300 Pro
Camera: ZWO ASI678MM
Mount: ZWO AM3
Guide Scope: ZWO APO 30mm F/5
Guide Camera: ZWO ASI120 Mini
Software: ASIAIR, Siril, GraXpert, StarNet
Accessories: ToupTek 1.25" SHO 6.5 nm, ZWO 1.25" RGB
Exposure:
150 x 150" ISO/Gain: 0 - S
150 x 150" ISO/Gain: 0 - H
150 x 150" ISO/Gain: 0 - O
80 x 15" ISO/Gain: 0 - R
80 x 15" ISO/Gain: 0 - G
80 x 15" ISO/Gain: 0 - B
Orange, Bortle 6 zone:
 Novosibirsk, Russia
 Oct 11th, 2025
19 h 45 m
159
Resolution: 1954x3286 px
Scale: 5339 KB
The nebula is assembled from SHO. Stars are substituted from RGB. It is visible that in RGB the stars are smaller and have more realistic colors, but after combining, halos appeared around the stars. Two images are provided - with the original stars from SHO and the substituted ones from RGB.

During imaging, a gain of 0 was used for maximum dynamic range so that the stars would not be overexposed. This turned out to be valid for all channels (small pixel of the planetary camera).
Updated
  13 Oct, 2025
  0
Another processing option. Less red.
  12 Oct, 2025
  20 h 5 m
Another processing option. I added an L channel to the stars. I cut out the stars using Starnet but combined them with SHO using pixel math. I worked with the n…
Current photo
  12 Oct, 2025
  19 h 45 m
The nebula is assembled from SHO. Stars are substituted from RGB. It is visible that in RGB the stars are smaller and have more realistic colors, but after comb…
  12 Oct, 2025
  18 h 45 m
Basic SHO assembly. The stars are original.
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