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[-] lefty7283@lemmy.world 4 points 6 days ago

I last shot this thing back in 2022, decided to give it another go from darker skies. Captured on April 19th, 2026 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: 8 hours 30 minutes (Camera at unity gain, -15°C)

  • L - 68x180"

  • R - 34x180"

  • G - 34x180"

  • 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

  • DrizzleIntegration (2x, Var β=1.5)

  • Dynamic Crop

  • Multiscale Gradient Correction with MARS Project data

Luminance linear:

  • BlurXterminator

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

  • ArcsinhStretch + HistogramTransformation to stretch nonlinear

RGB Linear:

  • Channelcombination to make color image from RGB stacks

  • SpectrophotometricColorCalibration

  • BlurXTerminator

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

  • HSV Repair

  • ArcsinhStretch + HistogramTransformation to stretch nonlinear

  • Slight curves saturation boost and histogram adjustments

Stars only image:

  • BlurXterminator for discortion correction and some mild star reduction

  • 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 small scale chrominance noise reduction

  • LocalHistogramEqualization

  • 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))

  • NoiseXTerminator for some small scale chrominance noise reduction

  • Resample to 80%

  • DynamicCrop in on just the galaxy

  • Annotation

[-] br3d@lemmy.world 1 points 5 days ago

Very nice detail - well done. This one's on my list to try to capture soon...

this post was submitted on 25 Apr 2026
57 points (100.0% liked)

Astrophotography

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