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Crescent Nebula in Ha and OIII

Started by rwodaski, 10/25/2002 01:41PM
Posted 10/25/2002 01:41PM Opening Post
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


Attached Image:

rwodaski's attachment for post 2051

Ron Wodaski
New Astronomy Press
http://www.newastro.com
Posted 10/25/2002 02:06PM #1
Great shot Ron!

Just one question. Does your OIII filter have a red leak? If so, how did you stop it? I tried some images with a lumicon OIII filter once but there was just too much red (infra-red?) light leaking through to be useful for colour.

Cheers,

Maurice

* Teach a man to fish and you feed him for a day.
* Teach a man to use the internet and he won't bother you for weeks.
Posted 10/25/2002 03:22PM #2
Posted 10/26/2002 11:43AM #3
Thats an exceptional image, Ron!

I like the "false color" images with narrowband filters, they supply really new unknown features.

Johannes