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Omega Centauri Globular Cluster(live.staticflickr.com)

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Omega Centauri is the largest globular cluster in the sky and contains about 10 million stars, but it’s generally considered a southern hemisphere target since it’s at -47 declination. It was right at the meridian for me while waiting for it to get completely dark out, so I tried shooting it at just 9 degrees up. Had to do short exposures without guiding, because even the dim flashlights of the other campers with me would overwhelm my guide camera. Captured on June 7th, 2024 from a Bortle 3 zone (Deerlick Astronomy Village)

Places where I host my other images:

Instagram | Flickr

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-120MC for guiding

  • Moonlite Autofocuser

Acquisition: 12 minutes (Camera at half Unity Gain, -15°C)

  • Lum - 20x10"

  • Red - 11x15"

  • Green - 13x15"

  • Blue - 12x15"

  • Flats- 30 per filter

Capture Software:

PixInsight Processing:

  • BatchPreProcessing

  • StarAlignment

  • Blink

  • ImageIntegration

  • DrizzleIntegration (2x, Var β=1.5)

  • DynamicCrop

  • 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:

  • BlurXTerminator (correct only mode)

  • ArcsinhStretch + histogramtransformation to bring nonlinear

RGB:

  • ChannelCombinaiton to combine monochrome R, G, B stacks into color image

  • BlurXTerminator (correct only mode)

  • SpectroPhotometricColorCalibration

  • HSV Repair

  • MMT for large scale chrominance noise reduction

  • ArcsinhStretch + histogramtransformation to bring nonlinear

Nonlinear:

  • LRGBCombination with stretched L as luminance

  • Several CurveTransformations to adjust lightness, contrast, colors, saturation, etc.

  • DeepSNR Noise reduction

  • HistogramTransformations

  • More curves

  • Resample to 70%

  • Annotation

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Astrophotography

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Welcome to !astrophotography!

We are Lemmy’s dedicated astrophotography community!

If you want to see or post pictures of space taken by amateurs using amateur level equipment, this is the place for you!

If you want to learn more about taking astro photos, check out our wiki or our discord!

Please read the rules before you post! It is your responsibility to be aware of current rules. Failure to be aware of current rules may result in your post being removed without warning at moderator discretion.

Rules

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  • Astrophotography refers to images of astronomical objects or phenomena exclusively.

  • Images that show objects or people below the Kármán Line (100km) will be removed. We won’t be enforcing this rule for now, but as the community grows eventually we will split and have a separate space for just landscape astro.

  • Images must be an accurate representation of a real astronomical object.

  • See this page for more details

  • II | Original and Amateur Content Only

  • Image posts can only be images that you have captured and processed yourself, or discussion about capturing and/or processing your own images.

  • Images acquired from public sources, professional observatories, or other professional services are not allowed.

  • If you have done a drastic alteration or reprocessing of a prior submission, you may repost your edit - but only after a minimum of one week has passed.

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  • Questions are welcome here for the time being.

  • Links to blogs, articles or external websites should be interesting and promote discussion about amateur astrophotography.

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  • All image posts should just include include the name of the object being photographed. Extra info such as equipment, it being your first image, or other information should go in a comment along with your acquisition info. Please see this page for more details.

If your post is removed, try reposting with a different title. Don’t hesitate to message the mods if you still have questions!

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  • All submitted images must include acquisition and processing details as a top-level comment. All posts without this information may be given a warning, and if not updated will be removed.

  • This includes the telescope, mount, camera, accessories, and any other pieces of equipment you used to capture the image.

  • You must also include processing details, i.e. the programs you used and a general rundown of the workflow/processes you used within those programs. “Processed in Photoshop” is not enough.

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