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10-September-2005, 09:53 PM
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The Dumbbell Nebula
Taken at the Oregon Star Party, USA. With Canon 20Da, Teleview 60mm refractor on a Losmandy mount. One 6 min exposure @f800.
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JPB 
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10-September-2005, 11:21 PM
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Nice! Tracking is a bit off though, but it sounds like you don't have a drive on the 'scope. Did you guide by hand?
The colors are interesting. I guess this is "true color". The red color is from hydrogen, and the blue-green from oxygen. The colors are interesting: the red is along the "caps", while the green appears to be coming from the middle and bursting out the sides. I'll have to think about that; I used to study planetary nebulae. You can learn a huge amount just by carefully examining the images and applying some physics.
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Phil Plait The Bad Astronomer http://www.badastronomy.com badastro@badastronomy.com
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11-September-2005, 06:30 AM
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Dumbbell Nebula
I didn't use any guiding, which I should have. I cropped and pumped up the contrast but made no color changes. It was 1st light for my Canon20Da so I was happy just to get some pictures
 I do like the colors though. They seem natural but only in the eye's of the beholder.
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JPB
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