this post was submitted on 23 Mar 2026
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Astrophotography

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[–] lefty7283@lemmy.world 2 points 21 hours ago

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