Here is a companion image to go with the Pelican I shot last month. The image is part of the North America Nebula, NGC 7000 in Cygnus. (There is actually a small overlap of this field of view with the Pelican shot, can you find it?)
More detail is visible if you click the image for a higher resolution version. Image acquisition details are here.
North America Nebula Narrowband
Re: North America Nebula Narrowband
It's gotta be magic 'cuz all my stars are always at least 20 times as big, not pinpoints.
Pete P.
Re: North America Nebula Narrowband
Another awesome image Andy!
One of the things I always enjoy about your images: I look at it and am awestruck with the detail, the focus, the colors, then I see the instructions to "click for more detail" and I'm blown away all over again!
One of the things I always enjoy about your images: I look at it and am awestruck with the detail, the focus, the colors, then I see the instructions to "click for more detail" and I'm blown away all over again!
Bruce D
Re: North America Nebula Narrowband
Thanks, Bruce!
Pete, I think the narrowband filters are largely responsible for reducing the size of the stars since they greatly reduce the flux of the stars relative to the nebulae. The same imaging gear with broadband (LRGB) filters definitely produces fatter stars. Also, this is a pretty wide field of view 1.6 x 1.2 deg (3x width of full moon) so stars of a given magnitude start out smaller than at longer focal length (is that just an effect of the seeing?). Ultimately, how the image is processed (stretched etc.) has a huge effect on how the stars come out looking. Of course focus, guiding, the scope's optics, and seeing conditions all play a role too.
Pete, I think the narrowband filters are largely responsible for reducing the size of the stars since they greatly reduce the flux of the stars relative to the nebulae. The same imaging gear with broadband (LRGB) filters definitely produces fatter stars. Also, this is a pretty wide field of view 1.6 x 1.2 deg (3x width of full moon) so stars of a given magnitude start out smaller than at longer focal length (is that just an effect of the seeing?). Ultimately, how the image is processed (stretched etc.) has a huge effect on how the stars come out looking. Of course focus, guiding, the scope's optics, and seeing conditions all play a role too.
Andy
Re: North America Nebula Narrowband
Just superb, Andy. Really brings out the artist in you.
Tom
Tom
Tom H
"Science knows no country, because knowledge belongs to humanity, and is the torch which illuminates the world. Science is the highest personification of the nation because that nation will remain the first which carries the furthest the works of thought and intelligence." - Louis Pasteur
"Science knows no country, because knowledge belongs to humanity, and is the torch which illuminates the world. Science is the highest personification of the nation because that nation will remain the first which carries the furthest the works of thought and intelligence." - Louis Pasteur