this post was submitted on 16 Dec 2025
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Astrophotography

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[–] DioramaOfShit@lemmy.world 4 points 1 week ago

Space is cool

[–] lefty7283@lemmy.world 2 points 1 week ago

Yippie my comment never posted from last night! here's the writeup:

Decided to give this one a reshoot under darker skies. My shot of it from 2019 had a lot more light pollution and less exposure time than this pic. M46 also has a small planetary nebula, NGC 2438, in the cluster. Captured on November 23rd, 2025 from a bortle 3 zone (Deerlick Astronomy village)


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: 1h 14m minutes (Camera at -15°C)

  • L - 20x90"

  • R - 10x90"

  • G - 10x90"

  • B - 9x90"

  • 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

linear:

  • 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

  • BlurXterminator (correct only)

  • STF applied via HistogramTransformation to stretch nonlinear

  • Channelcombination to make color image from RGB stacks

  • SpectrophotometricColorCalibration

  • HSV Repair

  • ArcsinhStretch + HistogramTransformation to stretch L and RGB images nonlinear nonlinear

  • Slight curves saturation boost for the RGB image

Nonlinear processing:

  • LRGBCombination with stretched L image as luminance

  • DeepSNR noise reduction

  • Lots of curve transformations

  • Slight SCNR to remove greens from some stars

  • more curves

  • Resample to 65%

  • Annotation