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Unmodified Nikon D50. 10 min @ ISO400; 10 min @ ISO200; 3 min @ ISO 400; 3 min @ ISO 200.
Dark subtracted. Aligned and combined the 10 min and 3 minutes as pairs in Registar. Then, combined the 10 and 3 min. combinations in ImagesPlus using ExcAvg.
20060930_M42-Comb-001.jpg
All images copyright William J. Shaheen, unless otherwise noted. Do not use or distribute without prior consent.