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Posts Made By: Jim Thommes

July 12, 2008 10:02 PM Forum: Digital SLR AstroPhotography

M8 and M20

Posted By Jim Thommes
I have done a little more with my Canon 350D DSLR. I have done a Baader ACF filter mod on the camera and this image is the first with that mod. The field is M8 and M20 combined. M21 is there too along with a few other objects. I was pleased with the H-Alpha emission response in red. I am calling the mod a success. Image as well as exposure and processing info is at the link below. The higher resolution images are a nice view if you have high speed. Highest resolution is at about 2 Mb.

http://jthommes.com/Astro/DSLR/M8-M20.htm

Megrez II APO 80 mm at f/5.5 (using WO FFIII)
Canon 350D Baader ACF modified - no external filters
G11/Gemini L3
Guiding - C8 at 1350 mm FL, DSI Pro, PHD Guiding


July 12, 2008 10:32 PM Forum: CCD Imaging and Processing/Deep Sky

M8 and M20

Posted By Jim Thommes
Sorry, another cross post with a DSLR image, But I liked this one and wanted to share it with my buds on this forum....

I have done a Baader ACF filter mod on the camera and this image is the first with that mod. The field is M8 and M20 combined. M21 is there too along with a few other objects. Image as well as exposure and processing info is at the link below. The higher resolution images are a nice view if you have high speed. Highest resolution is at about 2 Mb.

http://jthommes.com/Astro/DSLR/M8-M20.htm

Megrez II APO 80 mm at f/5.5 (using WO FFIII)
Canon 350D Baader ACF modified - no external filters
G11/Gemini L3
Guiding - C8 at 1350 mm FL, DSI Pro, PHD Guiding


July 17, 2008 04:04 AM Forum: CCD Imaging and Processing/Deep Sky

NGC 7538 Ha RGB

Posted By Jim Thommes
Greetings,
NGC 7538 is a little nebula in a larger complex that includes the Bubble Nebula and the Squid Nebula on the border of Cassiopeia and Cepheus. Its pretty small and has proven a tough capture for me. Image is at:

http://jthommes.com/Astro/NGC7538.htm

C8 at f/7.3
Artemis285 Ha RGB filters
G11/Gemini
Guiding - Megrez II at 1350 mm FL, DSI Pro, Phd Guiding

Older image is here:

http://jthommes.com/MiscAstro/Archives/NGC7538.htm


July 21, 2008 12:29 AM Forum: CCD Imaging and Processing/Deep Sky

Barnard 92 and 93

Posted By Jim Thommes
Well, I was really going for Sharpless 41, but Barnard's dark nebulas are too prominent in this image to call it Sharpless 41. The Luminance channel was made from H-Alpha and visible spectrum exposures (mostly H-Alpha). Oh, and the Sharpless is there but more as an amorphous red hue than anything else. Full image is at:

http://jthommes.com/Astro/B92_B93_Sh2-41.htm
(be sure to click on the image for higher resolution image)

Megrez II APO 80 mm at f/4.8
Artemis285 H-Alpha, IR/UV Block, RGB filters
G11/Gemini
Guiding - C8 at 1350 mm FL, DSI Pro, PHD Guiding

July 28, 2008 02:44 AM Forum: CCD Imaging and Processing/Deep Sky

M107

Posted By Jim Thommes
This image of M107 almost wasn't. Data was from early May and it was poor. Seeing was not what was needed for globular clusters and the data had tracking errors. I almost threw it out. But I decided that the image I had of M107 needed update so I took a shot at the data. There was star trailing repair in the processing and I actually used some of the earlier image data to help core definition. The resulting image is at:

http://jthommes.com/Astro/M107.htm

The image data was taken at 2x2 bin and later up sampled to 200% ( like it would be if I had taken the data at 1x1 bin)

Scope - C8 at f/7.5
Artemis285 IR UV Block and RGB filters
G11/Gemini
Guiding - Megrez II 80 mm at 1350 mm FL, DSI Pro, PHD Guiding

The earlier image is here:

http://jthommes.com/MiscAstro/Archives/M107.htm


August 5, 2008 04:06 AM Forum: CCD Imaging and Processing/Deep Sky

Network Nebula NGC 6992, 6995

Posted By Jim Thommes
Here is a recent image of the Network Nebula portion of the Cygnus Loop.

http://jthommes.com/Astro/NGC6992.htm
(be sure to click on the image for full size)

Scope - Megrez II 80 mm APO
Artemis285 - H-Alpha (13 nm Astronomik), IR/UV Block, RGB
G11/Gemini
Guiding - C8 at 1350 mm FL, DSI Pro, PHD Guiding

It was fun to look back at some images of these object that I have done in the past. (Sorry for the multiple orientations.)

http://jthommes.com/MiscAstro/Archives/NGC6992.htm
(2005)

http://jthommes.com/MiscAstro/Archives/VeilEast.htm
(2003)

August 12, 2008 02:57 AM Forum: Digital SLR AstroPhotography

M33

Posted By Jim Thommes
More adventures with the DSLR.... Here is M33. I did this image of M33 with 10 x 10 minute subs (at f/6.2). I seem to have a fair amount of noise for this long of an exposure when I think I expected a little less. A full size image and exposure / processing details are at:

http://jthommes.com/Astro/DSLR/M33DSLR.htm

Camera - Canon 350D (Baader ACF modified)
C8 203 mm at f/6.2
G11/Gemini
Guiding - Megrez II at 1350 mm FL, DSI Pro, PHD guiding

An interesting comparison to an earlier CCD image is here (although I have to say that back in 2005, I may have brought less processing experience to the CCD image):

http://jthommes.com/Astro/m33.htm#M33-2


August 17, 2008 09:24 PM Forum: CCD Imaging and Processing/Deep Sky

Pelican - Ha, RGB

Posted By Jim Thommes
I recently did an image of the Pelican Nebula in Ha and RGB. I think the detail came out good but the optical set up made for a less than ideal framing/composition of the object. I cut off the top of Big Bird's head. The full size image and exposure / processing details are at:

http://jthommes.com/Astro/Pelican.htm
(be sure to click on the image for full size)

Megrez II at f/4.8 (with WO FFIII)
Artemis285 Ha RGB filters
G11/Gemini
Guiding: C8 at 1350 mm FL, DSI Pro, Phd Guiding

I have taken several images of the Pelican over the years. past images are here:

http://jthommes.com/MiscAstro/Archives/Pelican.htm
(August 2005)

http://jthommes.com/MiscAstro/Archives/PelicanA.htm
(June 2003)


August 24, 2008 07:57 PM Forum: Digital SLR AstroPhotography

Gamma Cygni and IC 1318 - Ha RGB

Posted By Jim Thommes
This image is made with my Canon 350D DSLR. It is modified (Baader ACF for Ha emission line). I also used a Astronomik EOS Ha filter(13 nm) for an exposure set - so it is first light for me on the filter. The EOS clip filter is pretty easy to use. You can remove the camera body from the telescope using the 1/4 turn bayonet. That way you can do a Ha exposure, then dismount the camera, remove the filter and remount the camera for an unfiltered RGB exposure set. In this way the framing and orientation is preserved and your optical train is essentially undisturbed - of course refocusing is necessary without the filter.

Full size image and exposure / processing details are here:

http://jthommes.com/Astro/DSLR/IC1318.htm
(be sure to click on the image or link for highest resolution)

Megrez II at f/5.4
Canon 350D (ACF modified) - one exposure set with Astronomik 13 nm Ha EOS clip
G11/Gemini
Guiding: C8 at 1350 mm FL, DSI Pro, Phd Guiding




August 24, 2008 08:01 PM Forum: CCD Imaging and Processing/Deep Sky

Gamma Cygni and IC 1318 - Ha RGB

Posted By Jim Thommes
I am finding the DSLR is very good when you want higher resolution and wide field, but even after a spectrum enhancement modification, the level of sensitivity does present some challenges over that of a monochrome CCD.

This image is made with my Canon 350D DSLR. It is modified (Baader ACF for Ha emission line). I also used a Astronomik EOS Ha filter(13 nm) for an exposure set - so it is first light for me on the filter.

Full size image and exposure / processing details are here:

http://jthommes.com/Astro/DSLR/IC1318.htm
(be sure to click on the image or link for highest resolution)

Megrez II at f/5.4
Canon 350D (ACF modified) - one exposure set with Astronomik 13 nm Ha EOS clip
G11/Gemini
Guiding: C8 at 1350 mm FL, DSI Pro, Phd Guiding

I have a similar image with an Artemis285 (CCD) made in 2005 (Weaker processing skills back then...):

http://jthommes.com/Astro/GammaCygni_IC1318.htm

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