Image consists of 30 minuntes luminance, 5min red, 5min green, and 7.5 blue.
Each subexposure was 30 seconds in duration. This is to be the short exposure
portion of a longer exposure M42. This one brings out the Trapezium, which gets
burnt out in longer exposures. I was surprised the image came out as well as it
did, given shortness of sub-exposures.