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ASTRO: NGC 6888, The "Crescent Nebula" in Cygnus
Taken under near-full moon. A 10:10:15 RGB image with an STL-1301E camera
and a 20-inch RC Cass working at around F/5. The focal reducer was never intended for this use/scope, and that may explain why flat-fielding brightened up the corners too much. For more info on NGC 6888, see: http://www.kopernik.org/images/archive/n6888.htm George Normandin |
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ASTRO: NGC 6888, The "Crescent Nebula" in Cygnus
Very nice image George. Very good signal for a RGB image. A "pure" RGB sure
makes colour processing easier, but none of my colour images would have enough signal to look good without an additional "L" image. Stefan "George Normandin" schrieb im Newsbeitrag ... Taken under near-full moon. A 10:10:15 RGB image with an STL-1301E camera and a 20-inch RC Cass working at around F/5. The focal reducer was never intended for this use/scope, and that may explain why flat-fielding brightened up the corners too much. For more info on NGC 6888, see: http://www.kopernik.org/images/archive/n6888.htm George Normandin |
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ASTRO: NGC 6888, The "Crescent Nebula" in Cygnus
"Stefan Lilge" wrote
... Very nice image George. Very good signal for a RGB image. Stefan, When I finally got to processing this one I was disappointed that the nebula was so dim. Then I checked the date/time and realized that it was taken under nearly full moon conditions. Imaging like that makes me realize what big city astronomers like you have to deal with all of the time! George N |
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ASTRO: NGC 6888, The "Crescent Nebula" in Cygnus
"Stefan Lilge" wrote
... Very nice image George. Very good signal for a RGB image. Stefan, When I finally got to processing this one I was disappointed that the nebula was so dim. Then I checked the date/time and realized that it was taken under nearly full moon conditions. Imaging like that makes me realize what big city astronomers like you have to deal with all of the time! George N |
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