Re: [APML] What lies beneath M78

["Mike Cook, AF9Y" <mwcook@concentric.net>]

Philip,

   You've got a good eye.  Actually the Ha was only used
as a 40% luminance to help preserve the weak blue areas.
In addition, I used approximately 30% of the blue channel
as another luminance layer to help balance the image.  My
visual magnitude in this direction is around a 4 mag so it
was extremely difficult to extract the broadband blue.  The
key was a combination of the IDAS LPF filter, large amounts
of stacking and much processing.


Date sent:      	Tue, 01 Jan 2002 17:06:13 +0000
To:             	astro-photo@seds.org
From:           	Philip Perkins <philip@astrocruise.com>
Subject:        	Re: [APML] What lies beneath M78
Send reply to:  	astro-photo@seds.org

> Mike,
> 
> That's a superb amount of detail to have recorded from a light polluted 
> site.  Some of the structures you have captured are very faint, even from 
> dark sites.  I was impressed by the amount of broadband (blue) light 
> recorded considering the use of an Ha luminance filter.  I understand of 
> course that the RGB was recorded separately using the Hutech filter but 
> even so this light still has to record somehow on the luminance image.
> 
> A very happy New Year to everyone!
> --Philip
> 
> 
> At 00:33 01/01/02 -0500, you wrote:
> >After seeing the Gendler and Loke postings of M78, I was
> >inspired to see how deep one could go to show the background
> >structure surrounding this area.  Using a 4 hour Ha base and
> >6 hours of RGB the background is beginning to show even
> >from my driveway with very polluted southern skies:
> >
> >http://www.webcom.com/af9y/m78hrgb.htm
> >
> >The upper right edge of this image shows the very weak
> >outer edge of Barnard's loop as it ripples into the reflection
> >area surrounding M78.  The colors are not spectacular with
> >the weak Ha showing a more of a magenta hue as it mixes
> >with the reflection nebula and background sky.
> >
> >
> >
> >Mike Cook, AF9Y
> >http://www.webcom.com/af9y
> >mwcook@cris.com
> 
> 
> 
> Philip Perkins - philip@astrocruise.com
> Wiltshire UK & Luberon France
> Astrocruise - http://www.astrocruise.com
> 
> 
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Mike Cook, AF9Y
http://www.webcom.com/af9y
mwcook@cris.com




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