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22-04-2010, 07:15 PM
avandonk
Join Date: Aug 2005
Location: Melbourne
Posts: 4,786
Coal Sack Mosaic
Only two panels so not all of it. Same exposures for both.
Details
Canon 5DH, Canon 300mm F2.8L at f3.5 with external aperture and lens hood extension. ISO 1600. Hutech LPR filter. Fridge at -11.0C.
Exposures 20x(15s, 30s, 60s and 120s). Usual HDR method. No enhancement.
Small image FoV 9.6 X 4.5 degrees 7MB
http://d1355990.i49.quadrahosting.co...OS_CSack_S.jpg
There is definite detail in the dust clouds.
Bert
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166.9 KB 102 views
22-04-2010, 07:18 PM
Registered User
Join Date: Jun 2006
Posts: 1,998
My god, it's full of stars!
22-04-2010, 07:20 PM
Registered User
Join Date: Feb 2005
Location: Monto
Posts: 16,741
One can study this region for ages.
22-04-2010, 07:28 PM
ze frogginator
Join Date: Oct 2007
Location: Sydney
Posts: 22,080
That is so cool.
There's a
little red nebula next to the jewel box that I picked up on one of my shot centered on alpha X. I though at the time it was just an internal reflection.
22-04-2010, 07:30 PM
Highest Observatory in Oz
Join Date: May 2006
Location: Canberra
Posts: 17,689
Yes, it's hardly a sack of coal... more like a bag of star dust
Mike
22-04-2010, 07:45 PM
Duncan
Join Date: Jan 2007
Location: Weipa FNQld
Posts: 1,091
WONDERFUL IMAGE!!! So full of detail. More than enough to keep one occupied for hours just picking it all out.
Cheers,
Duncan
22-04-2010, 07:53 PM
sword collector
Join Date: Oct 2006
Location: Mount Evelyn
Posts: 2,925
The coalsack is a dark region devoid of stars Bert, You debunked the myth
Bloody well done
22-04-2010, 07:57 PM
Narrowfield rules!
Join Date: Nov 2006
Location: Torquay
Posts: 5,065
Top work Bert, nice stitching and star colour.
22-04-2010, 08:20 PM
Registered User
Join Date: Feb 2006
Location: Sydney
Posts: 18,185
Fabulous and very interesting image Bert.
22-04-2010, 08:50 PM
avandonk
Join Date: Aug 2005
Location: Melbourne
Posts: 4,786
Glad you all like it. Here is the panorama version with the Dark Doodad. It was a fluke that they almost lined up as the Doodad was from last week.
FoV 15.73 X 4.25 degrees. 6MB
http://d1355990.i49.quadrahosting.co...S_CSack_DD.jpg
Bert
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183.6 KB 39 views
22-04-2010, 09:25 PM
Duncan
Join Date: Jan 2007
Location: Weipa FNQld
Posts: 1,091
Spectacular Bert. Heaps of stuff in there for future reference. Would love to get some close ups of some of the things in it.
Cheers,
Duncan
23-04-2010, 01:01 PM
avandonk
Join Date: Aug 2005
Location: Melbourne
Posts: 4,786
All those faint stars and dust folks are below noise level with the sensor at normal ambient temperature. It is the HDR processing that shows both bright stars and very dim ones in the same crappy eight bit JPG and the fridge keeps the noise to a managable level. You should see the 340 MB TIFF. The HDR process also gives me the colours of all the stars as nothing is saturated.
23-04-2010, 03:39 PM
Have scope will travel!
Join Date: Jan 2009
Location: Pitnacree NSW
Posts: 1,501
Bert,
23-04-2010, 04:36 PM
Registered User
Join Date: Mar 2008
Location: Melbourne
Posts: 113
Very, very impressive. Lots of deep sky interest there. Keep up the good work.
Russ.
02-05-2010, 07:01 AM
Registered User
Join Date: Nov 2008
Location: Canberra
Posts: 581
Thats excellent Bert,
02-05-2010, 01:25 PM
Registered User
Join Date: Aug 2006
Location: Western Australia
Posts: 8,283
Very fine job Bert
02-05-2010, 03:54 PM
1 of 7 of 9
Join Date: Sep 2009
Location: Perth
Posts: 1,968
Great pic!
02-05-2010, 07:09 PM
Registered User
Join Date: Aug 2007
Location: Bowen Mountain
Posts: 837
Yes, detail in the dust clouds and masses of stars! Will you be taking more shots to complete the mosaic?
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There's a 
Russ.
