Widefield picture of the Swan Nebula (M17) region

Posted by jmeriaux
on Friday, August 27, 2010

by Jean-Christophe Meriaux, San Bruno, CA


Date: 8/9/2010 – San Bruno, California – near the SFO airport skylight dome... Modified Canon XTi and Astronomik CLS CCD filter to (try) to beat the light pollution! Seeing: 3/6 – Wind between 5mph and 10mph Mount: Astrotrac travel system Camera: Modified Canon XTi (Standard IR filter replaced with an astrodon IR filter by Hap Griffin) with Canon 200mm f/d 2.8 teleobjective (prime lens) opened at f/d 3.5 – at Iso 400. 22 exposures of 90 seconds with Astronomik CLS CCD clip filter, 10 flats frames, 10 darks, 10 biais. Processing: MaximDL5: darks and flats subtraction, alignment and averaging Photoshop CS4: stretching, selective sharpening Noise Ninja: noise removal I used a Bahtinov mask as a focus help on a bright star (Antares). More information on my blog http://messier42.us

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