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M42 - Great Orion Nebula


From the author of   Sizing Up The Universe


Natural
M42

Tarted Up
M42

03:27 EDT Oct 17, 2004.
Starlight Express SXV-H9 on 4" Tak FSQ refractor at f/5.
Photoshop LayerMask of a long and a short exposure.
Long Exposure: L = R = Ha = 60 mins, G = 6 mins, B = 4 mins (unguided 2-minute subexposures).
Short Exposure: L = R = Ha = 2 mins, G = B = O-III = 2 mins (unguided 20-second subexposures).

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