Using my NGC6357 data from May 2019, I heavily cropped and re-processed the core region. This chaotic scene in space holds home to some of the most massive stars, who's stellar winds shape and excite the dust around them to form these intricate glowing nebula.
In this false-color narrowband image, I display the sulfur and hydrogen signal as the warm tones, and oxygen as blue.
OTA: William Optics GT81 w/0.8x reducer (382mm fl at f/4.7)
74mm aperture stop-down ring (brings scope to f/5.2)
Mount: Orion Sirius EQ-G (HEQ-5)
Guidescope: Orion 50mm guidescope
Guiding camera: Orion StarShoot Autoguider
Imaging camera: ZWO ASI1600MM-Cool
Location: Atoka, OK (Bortle 3)
Dates: 5/31/19, 6/26/19, 6/27/19
Gain: 200 Offset: 50
Camera temp: -10C
Sii: 34x300" Astrodon 3nm
Ha: 35x300" Astrodon 5nm
Oiii: 33x300" Astrodon 3nm
Total integration time: 8hr 30min
64x darks per calibration (master from library)
30x flats per calibration
200x bias per calibration (master from library)
See my previous widefield posting of NGC6357 for processing workflow. The workflow was very similar except all channels were Drizzled 2x for better resolution of the core area.