M42 Region - Great Nebula in Orion and surroundings         (image above is reduced-size | other sizes:  medium , original)

Distance:  1,344 light years

Telescope Takahashi FS-60C @ f/6.2
Mount Takahashi EM200 Temma II
Camera QSI 540wsg @ -15C
Filters Astrodon Ha (3nm), Astrodon Tru-Balance I-Series LRGB Gen 2
Guider SX Lodestar
Settings 18x5min Ha; 3x5min,14x2min L (bin1x1); 5x1min ea RGB (bin2x2); AstroArt5, CS4 (slightly cropped, 10xdarks/flats/fdarks/bias)

8 February 2015 - Las Cruces, NM

This image is LHaRGB, where Ha:L (50:50) was used for Luminance, and Ha:R (80:20) was used for the Red channel. My second try at blending, and I used much shorter subs for RGB on this image compared to my result from March 2014. I also used a combination of 5min and 2min subs for the Lum channel. Thus, I was able to better resolve the very bright core. With the shorter subs on this object, was able to collect many frames, which nicely increases the signal:noise (SNR).

Copyright  Jeffrey O. Johnson

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