This image of the Crescent Nebula combines light emitted in H-alpha (red) and Oxygen III (blue/green). It reveals details in the Crescent that are very hard to see, if not invisible, in white-light and RGB images. I was surprised to find such large, bright structural details that I had never seen before.
Imaged with FCT-150, CM-10E camera on Paramount ME. Filters are from Custom Scientific. I can't find my notes on total exposure time, bit typically it would be on the order of about two hours per filter. This particular version has been stretched hard to bring out faint details.
Ron Wodaski
author of "The New CCD Astronomy"
http://www.newastro.com
Imaged with FCT-150, CM-10E camera on Paramount ME. Filters are from Custom Scientific. I can't find my notes on total exposure time, bit typically it would be on the order of about two hours per filter. This particular version has been stretched hard to bring out faint details.
Ron Wodaski
author of "The New CCD Astronomy"
http://www.newastro.com
Attached Image:
Ron Wodaski
New Astronomy Press
http://www.newastro.com