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ASTRO: NGC 2024, the Flame Nebula in Orion
I took this about a week ago. The image has a number of artifacts, including
a reflection from 2nd magnitude Alnitak, the eastern star in Orion's belt, which is just outside the image. When I tried to reduce the impact I lost part of the nebula. Also my 50mm focal reducer lens was not designed to work with the OGS 20-inch. However working at around F/5 this image is 20x23 arc minutes. The exposure was 10:5:10:10 minutes exposure in red, green, blue, and luminance. George Normandin |
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ASTRO: NGC 2024, the Flame Nebula in Orion
that's really nice George
you did a nice job on that across the board in my opinion rdc "George Normandin" wrote in message ... I took this about a week ago. The image has a number of artifacts, including a reflection from 2nd magnitude Alnitak, the eastern star in Orion's belt, which is just outside the image. When I tried to reduce the impact I lost part of the nebula. Also my 50mm focal reducer lens was not designed to work with the OGS 20-inch. However working at around F/5 this image is 20x23 arc minutes. The exposure was 10:5:10:10 minutes exposure in red, green, blue, and luminance. George Normandin |
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ASTRO: NGC 2024, the Flame Nebula in Orion
Very nice picture George. Actually the Flame would not be the same without
the artifacts of Alnitak, I think most pictures have them. Stefan "George Normandin" schrieb im Newsbeitrag ... I took this about a week ago. The image has a number of artifacts, including a reflection from 2nd magnitude Alnitak, the eastern star in Orion's belt, which is just outside the image. When I tried to reduce the impact I lost part of the nebula. Also my 50mm focal reducer lens was not designed to work with the OGS 20-inch. However working at around F/5 this image is 20x23 arc minutes. The exposure was 10:5:10:10 minutes exposure in red, green, blue, and luminance. George Normandin |
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ASTRO: NGC 2024, the Flame Nebula in Orion
George Normandin wrote: I took this about a week ago. The image has a number of artifacts, including a reflection from 2nd magnitude Alnitak, the eastern star in Orion's belt, which is just outside the image. When I tried to reduce the impact I lost part of the nebula. Also my 50mm focal reducer lens was not designed to work with the OGS 20-inch. However working at around F/5 this image is 20x23 arc minutes. The exposure was 10:5:10:10 minutes exposure in red, green, blue, and luminance. George Normandin I had so many donuts from Alnitak that you could hardly see the nebula when I tried it. Seemed to reflect back and forth between the Halpha filter and something. It was a mess. I wanted to try again this year with it on the eastern side of the meridian hoping that might help. But the weather had other ideas. Rick -- Correct domain name is arvig and it is net not com. Prefix is correct. Third character is a zero rather than a capital "Oh". |
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ASTRO: NGC 2024, the Flame Nebula in Orion
great shot George! I never had much luck with this one...
George Normandin wrote: I took this about a week ago. The image has a number of artifacts, including a reflection from 2nd magnitude Alnitak, the eastern star in Orion's belt, which is just outside the image. When I tried to reduce the impact I lost part of the nebula. Also my 50mm focal reducer lens was not designed to work with the OGS 20-inch. However working at around F/5 this image is 20x23 arc minutes. The exposure was 10:5:10:10 minutes exposure in red, green, blue, and luminance. George Normandin -- John N. Gretchen III N5JNG NCS304 http://www.tisd.net/~jng3 |
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ASTRO: NGC 2024, the Flame Nebula in Orion
"Stefan Lilge" wrote ... Very nice picture George. Actually the Flame would not be the same without the artifacts of Alnitak, I think most pictures have them. Stefan, The artifact shows much less in the red exposure (since Alnitak is so blue?). I went so long in red with the idea of using it for the Lum, but alas, the Lum shows much more of the nebula. I had thought of rotating the camera and taking a second series that I could combine with the first using a sigma-reject. That might remove the artifact. However the temp was well below freezing and my brain froze before I got the second set of exposures...... One item of luck I did have: one of the stars is listed as the same red and blue magnitudes in the USNO 2 catalog, and thus must be a G-2 star. I was able to use it to calibrate the color for this image and perhaps others. George N |
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ASTRO: NGC 2024, the Flame Nebula in Orion
"John N. Gretchen III" wrote .... great shot George!........ John, et al: Thanks for the kind words guys! George N |
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