• @lefty7283OPEnglish
    7•3 months ago

    It may not be as big or well known as the other well known cluster in Hercules (M13), but it sure looks nice. Captured over 4 nights in July/August 2024 from a Bortle 9 zone

    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: 6 hours 55 minutes (Camera at half Unity Gain, -15°C)

    • Lum - 209x60"

    • Red - 78x60"

    • Green - 62x60"

    • Blue - 66x60"

    • Flats- 30 per filter

    • 24 JimmyFlats per filter

    Capture Software:

    PixInsight Processing:

    • BatchPreProcessing (with premade JimmyFlats)

    • 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

    • ArcsinhStretch + histogramtransformation to bring nonlinear

    • Curves to saturate it a little

    • MLT for large scale chrominance noise reduction

    Nonlinear:

    • LRGBCombination with stretched L as luminance

    • DeepSNR Noise reduction

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

    • Invert > SCNR > invert > SCNR to remove some greens and magentas

    • More curves

    • A little bit of noiseXterminator

    • DynamicCrop in on the clustert

    • Resample to 75%

    • Annotation