• lefty7283@lemmy.worldOPMEnglish
    3·
    8 months 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