Object: M42 "The Great Orion Nebula" - Author: Samuele Gasparini (My Internet site: www.astrobook.it) - Equipment: Refractor Skywatcher 80Ed with flattener/reducer 0.85X and camera Moravian G2-4000; HLRGB Baader Filters. - Exposure Times: 5x300sec+5x60sec+5x120sec+6x300sec+2x600 sec for each HLRGB channel Bin 1x1. - Processing with Pixinsight e Ps Cs3.