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DJMcCrady
Carpal Tunnel
Reged: 06/27/03
Posts: 1692
Loc: Seattle, WA
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There’s been nothing but clouds and fog in Seattle for a very long time, so I’ve been re-examining some old data. One such set I revisited was of M81/M82 taken back on October 30th. In my original version, I had aggressively reduced the background to hide some unevenness. Some of you commented on it. Since then I’ve visited Steve Mandel’s Unexplored Nebula Project and discovered that the unevenness was at least partially due to some of the integrated flux nebula that I had picked up unbeknownst to me. It was barely there above the skyglow and part of it was actually obliterated by a gradient.
Here is the reprocessed version of M81, M82, and NGC 3077 with the background enhanced as best I could.
The background is still low so it may be hard to see. One telltale sign is a slightly darker “halo” around M81, where the density of the integrated flux nebula is lower than the surrounding area. The lower-left portion of this image suffered a gradient, so there is no detail there, but there are subtle fluctuations in background brightness in other areas.
Image details:
Takahashi Sky 90 at f/4.5
SBIG STL-4020M (self-guided)
Takahashi EM-200
Hutech LPS Filter
L:90, R:30, G:30, B:30 (5 minute subs)
Processed in Maxim/DL and Photoshop
Noel Carboni's Astronomy Tools Actions
I blended the background luminance into the blue channel at about 17% transparency, which is why the background is tinted blue.
Thanks for looking, and I welcome comments.
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++don;
http://starryvistas.net
Tak Sky 90, Tak EM200, STL-4020M
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bill w
Postmaster
Reged: 03/26/05
Posts: 10277
Loc: southern california
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nice job
the faint detail is definitely better
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-bill w
nexstar 8 GPS
canon 300D, Toucam Pro II
SXV-H9C, H9, SX Lodestar autoguider, SX-AO, DMK 51
FS 102 (OLV), FS60 CSV, 8" LX200R, Lunt 60/50 double stacked PT B1200, Losmandy G 11, ASA DDM60
http://astro.whwiii.net/
image processing monitor calibrated to just differentiate darkest boxes:
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Zyxlor
Carpal Tunnel
Reged: 09/10/05
Posts: 2335
Loc: In my RV - Anywhere USA
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Color me green!
Beautiful image!
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Zyxlor
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Dean
Postmaster
Reged: 12/31/04
Posts: 5431
Loc: Bailey Co Elev 8780 feet
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Cool Don!
I've gone back and looked at some of my images and they had the IFN and I had processed it out as well, apparently it isn't that tough to pick up.
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"Don't sweat the petty things and don't pet the sweaty things" - George Carlin
deanrowe.net/astro
Whats with that avatar?
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Dr Nick
scholastic sledgehammer
Reged: 01/27/06
Posts: 798
Loc: Glen Innes, NSW, Australia
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Nice, I just love this region 
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Clear Skies, Nick
http://www.NicksAstronomy.com
Sky Watcher 8" f/5 Newtonian(which I got when I was 10yrs old and 5yrs later I'm still adding to) w/JMI motofocus/standard, axis guider.
ToUcam Pro w/Phillips vlounge/registax/and Virtual Dub,
DSI Pro II w/envisage/photoshop cs2/,
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badsnoopy
One star is enough
Reged: 12/20/04
Posts: 3556
Loc: La Porte, IN
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Amazing region. Very nice.
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Robert
TV Genesis SDF
Losmandy G11
10x14 Roll roof observatory
Lumenera SkyNyx 2-2m
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