M42

Technical Data
  Optics

Takahashi TOA-150 refractor (D=150mm, F7.3) with field flattener
  Camera Apogee F16M (KAF-16803) cooled to -20 deg C
  Tracking Takahashi EM-400 mount, 7cm/F8 guide scope
Fishcamp Starfish CCD camera
Autoguided with MaxIM DL
  Exposure

L: 5 min * 32 (160 min total)
R: 5 min * 6 + 5 sec * 6
G: 5 min * 6 + 5 sec * 4
B: 5 min * 8 + 5 sec * 4
  Time 2013/12/31
  Location Mt. Shiao-Shuei, Taiwan
  Note

Bias, dark, and flat-field corrections, and drizzle stacking were made in my self-written program. Images were further aligned in Registar. LRGB composition and final processing were made in Photoshop CC.
  Larger Images

high resolution (0.74 MB)