Finally going through my processing backlog! I tried to get some Ha on this from home, but I had too many obstructions to shoot at this declination. Decided to keep this as a wider crop since most the images of this I see are cropped in on just the nebula itself. Captured captured on November 23rd, 2025 from a Bortle 3 zone (deerlick astronomy village).

Places where I host my other images:

Flickr | Pixelfed

Equipment:

• TPO 6" F/4 Imaging Newtonian

• Orion Sirius EQ-G

• ZWO ASI1600MM-Pro

• Skywatcher Quattro Coma Corrector

• ZWO EFW 8x1.25"/31mm

• Astronomik LRGB+CLS Filters- 31mm

• Astrodon 31mm Ha 5nm, Oiii 3nm, Sii 5nm

• Agena 50mm Deluxe Straight-Through Guide Scope

• ZWO ASI-290mc for guiding

• Moonlite Autofocuser

Acquisition: 10 hours 12 minutes (Camera at unity gain, -15°C)

• L - 97x180"

• R - 37x180"

• G - 36x180"

• B - 34x180"

• Darks- 30

• Flats- 30 per filter

Capture Software:

• Captured using N.I.N.A. and PHD2 for guiding and dithering.

PixInsight Preprocessing:

• BatchPreProcessing

• StarAlignment

• Blink

• ImageIntegration per channel

The luminance data was split into 3 stacks and combined to use the single channel DeepSNR method

• DrizzleIntegration (2x, Var β=1.5)

• Dynamic Crop

Luminance linear:

• MultiscaleGradientCorrection using MARS Project data

• BlurXterminator

• StarXterminator to completely remove stars (extracted stars processed separately)

• STF applied via HistogramTransformation to stretch nonlinear

RGB Linear:

• Channelcombination to make color image from RGB stacks

• MultiscaleGradientCorrection

• SpectrophotometricColorCalibration

• BlurX (correct only mode)

• StarX to remove stars (to be used for star addition later)

• StarX to extract a stars only image

• ArcsinhStretch + HistogramTransformation to stretch nonlinear

• Slight curves saturation boost and histogram adjustments

Stars only image:

• HSV repair

• ArcsinhStretch + HistogramTransformation to stretch nonlinear (less aggressive stretch)

• Slight curve adjustments

Nonlinear Processing

• LRGBCombination to combine stretched RGB and L images

• DeepSNR Noise reduction

• Shitloads of curve transformations to adjust luminance, contrast, saturation, etc

• More curves

• NoiseXTerminator for some small scale chrominance noise reduction

• LocalHistogramTransformation

• Even more curves

• ColorSaturation adjustments (get rid of some background greens)

• Pixelmath to add in the stretched stars only image from earlier

  This basically re-linearizes the two images, adds them together, and then stretches them back to before. More info on it here)

  mtf(.005,

  mtf(.995,Stars)+

  mtf(.995,Starless))

• Resample to 60%

• Annotation