this post was submitted on 29 Jul 2025
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Astrophotography

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[–] Nebula@fedia.io 3 points 4 days ago

Ooh, that's my cousin. Hi. 😊

[–] lefty7283@lemmy.world 3 points 4 days ago

After months of clouds and rain, I had a clear night and went out to a dark site! I shot this a few years back in narrowband which helped show the faint outer shell, but this time I decided to photograph it in true color LRGB. Captured on July 26th, 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: 2 hours 50 minutes (Camera at -15°C), halfunity gain

  • L - 31x120"

  • R - 19x120"

  • G - 18x120"

  • B - 17x120"

  • 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

  • DynamicBackgroundExtraction

    duplicated each image and removed stars via StarXterminator. Ran DBE with a shitload of points to generate background model. model subtracted from original pic using the following PixelMath (math courtesy of /u/jimmythechicken1)

    $T * med(model) / model

Luminance Linear:

  • Blur and noisexterminator

  • ArcsinhStretch + HistogramTransformation to stretch nonlinear

RGB Linear:

  • ChannelCombination to combine monochrome R G and B images in to single color image

  • SpectrophotometricColorCalibration

  • BlurXterminator (correct stars only)

  • HSV Repair

  • ArcsinhStretch + HistogramTransformation to stretch nonlinear

  • Slight saturation curve boost

Nonlinear Processing:

  • LRGBCombination to combine stretched RGB and L images

  • NoiseX again (more for chrominance noise)

  • LocalHistogramEqualization

  • Several rounds of curve adjustments for lightness, contrast, saturation, color balance, with various masks

  • Resample to 80%

  • Tighter crop in on just the nebula

  • Annotation

[–] Gnomie@lemmy.world 2 points 4 days ago

I wish I could give you more than 1 upvote for including all the details. Great result, thanks for sharing.