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M17

Started by hakescl, 05/30/2008 12:13AM
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Posted 05/30/2008 12:13AM | Edited 05/30/2008 12:14AM Opening Post
Charles Hakes
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Join Date: Jun 2001

Location: Durango CO, US

Posts: 690

A little easier to process this one than those elliptical galaxies. Again, the 10" f6.3 scope. This time LRGB ~23:11:10:9 in 1min subs. After the fact I think I would re-frame it.

Charlie

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Fort Lewis Observatory: (37.238, -108.052) ~2360m (7744 ft.) elevation.
Darkness - typically 6.5+
Scope - Meade 16" LX200; f6.3 focal reducer
Focus - JMI Smart focus
Camera - SBIG ST-10XE; (~.5"/pixel)
Guiding - AO-8 and/or Meade 5"/DSI/PHD
http://www.fortlewis.edu/observatory
Posted 05/30/2008 12:35AM #1
Roland Christen
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That's not a bad result with the limitations of the RGB filters. For galactic nebulae you will have much better results if you go narrow band, even if you simply add a single Ha exposure to your RGBs as Luminance layer.

Here is an example, a narrow band color image taken with Ha as red, SII as green and OIII as blue. Scope used was a 140F7.5 Apo refractor operating at F5.7. You will notice that the stars get really small with narrow band filters, which allows the nebula to pop out from behind the bright Milky Way stars. It also brings out lots of knots and nebular detail that is missing in RGB.

Rolando

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