This is a HDR image of M42 - The Great Orion Nebula. A combination of two images was made in order to show the much brighter core. Exposure times are  L - 30min, R - 30min,  G - 30min, B - 35min  for the entire nebula and 10s in each LRGB channel for the core. The image then was assembled in Photoshop CS, afterwards some histogram stretching and HDR wavelet transformation were done in PixInsight 1.6

The 12 inch ASA astrograph is mounted on ASA DDM85 mount, without guiding. This is a LRGB image respectively 55, 30, 30 and 40 min in each channel.