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It’s one of the most recognisable objects in the night sky and one of the hardest to process due to the massive differences in brightness between the inner core and outer dusty regions. I managed to pull it out using local histogram equalization in PixInsight, although I was unable to avoid it causing dark halos on the brighter stars, even when using a star mask. Not bad for 6 subs though, will need to try and add to it.

Camera: Atik 383L+ Mono with Astrodon 5nm Ha (-30°C)
Scope: Borg 101EDII with 0.7x Reducer @ F4.4
Mount: EQ6 with EQMOD
Guiding: OAG with QHY5
Capture Software: CCD Commander, Maxim DL
Processing Software: Deep Sky Stacker, PixInsight
Exposures: 6 x 15 mins, 12 x 60 secs, 12 x 30 secs, 12 x 10 secs (HDR)
Calibration: 25 x Darks, 25 x flats, 50 x Bias

M42_hdr_ha_

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