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Captured by
Douglas Rollain

Lion Nebula SH2-132 - RC71

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Posts Made By: Jim Thommes

November 19, 2006 11:32 PM Forum: CCD Imaging and Processing/Deep Sky

The Large Magellanic Cloud

Posted By Jim Thommes
Greg,
Great image! Thanks for these beauties that those of us up North can't get.

November 19, 2006 11:47 PM Forum: CCD Imaging and Processing/Deep Sky

NGC 891

Posted By Jim Thommes
Thanks for the comments....

Dan,
Thanks for the comment on the processing. I'm having almost as much fun with the processing these days as with the data collection in the field.

November 21, 2006 05:35 AM Forum: CCD Imaging and Processing/Deep Sky

IC1848 - Epsilon 160 - from Utah

Posted By Jim Thommes
Tyler,
Nice image. You are really doing well with the Tak, ST2000 and Ha.


November 24, 2006 07:43 PM Forum: CCD Imaging and Processing/Deep Sky

NGC 2174

Posted By Jim Thommes
Dan,
Very nice shot. I love the depth and the star sizes. The narrow band color mapping brings a lot to this object. I suspect that the detail comes out due to the good data you were able to start with. (As you subsequently mentioned)

There is one thing that surprises me about your image.... Given your color mapping, I would have thought that H-Alpha (green) would have dominated in the interior of the object; instead, OIII seems to have dominated.

November 24, 2006 07:47 PM Forum: CCD Imaging and Processing/Deep Sky

Turkey Nebula for Thanksgiving Day

Posted By Jim Thommes
Nice shot Tyler!
And a happy Thanksgiving holiday to you too. (what a nice image posting tradition.)

November 25, 2006 11:49 PM Forum: CCD Imaging and Processing/Deep Sky

Pacman

Posted By Jim Thommes
David,
Congrats on a very fine image. The detail is very good and the dynamics of the star sizes and intensities is very natural.

November 25, 2006 11:51 PM Forum: CCD Imaging and Processing/Deep Sky

Sharpless 2-170 HaRGB

Posted By Jim Thommes
Ivan,
Thanks for the comment.

November 27, 2006 12:57 AM Forum: CCD Imaging and Processing/Deep Sky

M31

Posted By Jim Thommes
Eric,
Nice Image! I think I prefer a little less blue in M31 than you have in this image, but the star colors are great , so maybe it's just me.

It is interesting that M31 mostly gets framed as you have done it rather than a more conventional "North up" framing.

November 28, 2006 05:20 AM Forum: CCD Imaging and Processing/Deep Sky

NGC 752 -Open Cluster

Posted By Jim Thommes
Thanks for the comments guys.

December 2, 2006 08:07 PM Forum: CCD Imaging and Processing/Deep Sky

how do set the correct colour in your image?

Posted By Jim Thommes
Greg,
One can take G2V calibrations each night to be very accurate. Or you could also use past data. The key is to make sure you take the image with the star unsaturated (i.e. usually very short). I use past G2V data regularly in calibrating colors on processing.

You can separate your colors on the DSLR data and do the same thing.

Also when shooting any object below 45 degrees you may want to consider an Atmospheric Extinction correction as well in your processing.

Here is what I do:

http://jthommes.com/Astro/NGC5128_ColorCor.htm

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