| Photograph Information |
Photographer's Comments |
Challenge: Free Study 2008-03 (Advanced Editing VII)
Camera: Canon EOS-350D Rebel XT
Location: Bedford, NH
Date: Mar 11, 2008
Aperture: 10
ISO: 800
Shutter: b
Galleries: Astrophotography
Date Uploaded: Mar 9, 2008
|
I am certainly enjoying my new toy (telescope)! This photograph is peering into the center of the Rosette nebula, a HUGE star forming region that's about 6x the width of the full moon! Unfortunately, it is so extraordinarily dim that you can't view it in a telescope, it's only viewable through long exposure photography. The color is true, the rosette has a somewhat purple hue to it because it's two dominant wavelengths are hydrogen alpha (red) and doubly ionized oxygen (teal).
Now about the photograph.
Telescope: Anttler's optics 10" reflector
Camera: Modified Canon 350xt
Mount: Losmandy G11
Filters: Hutech IDAS (light pollution), Baader Hydrogen Alpha
Camera settings: ISO800, noise reduction on, Bulb
Registration: All images are aligned to a single "base" image using Registar
This is a composite of 10 exposures, 4 of the exposures are 10 minutes each and taken with a Baader Hydrogen Alpha filter, the red channel was cut and pasted to the green and blue channels making a greyscale RGB. This image is used as a luminance channel in the final image. The RGB image is a composite of 6 8 minute exposures taken with a Hutech light suppressant filter (for overcoming light pollution) and stacked and flattened in photoshop. The red channel of the RGB image and the greyscale luminance image were combined and flattened (50/50) and pasted back into the red channel. The 50/50 channel is the new luminance layer. Curves, saturation and contrast applied to both the luminance and RGB images and flattened.
While all this sounds somewhat daunting, using the luminance layer is the best way to deal with light pollution and I do all this work with actions, so post processing is a snap. |
| Author | Thread |
|
|
05/18/2008 07:44:19 PM |
| I am truly impressed with your work and the knowledge you have about it. Congratulations on such amazing photographs |
|
 Photographer found comment helpful. |
|
|
04/08/2008 03:34:56 AM |
| I agree with the frame suggestion, but the work and result put into the shot is impressive. |
|
| Photographer found comment helpful. |
|
|
04/08/2008 12:46:40 AM |
Wonderful star shot, but maybe the frame is not necessary on here.
Message edited by author 2008-04-08 00:46:54. |
|
| Photographer found comment helpful. |
Comments Made During the Challenge  |
|
|
04/07/2008 08:16:09 AM |
| There's not much to say for these kind of images, because technicalities go beyond standard photography and the art here is more in the thought and contemplation, rather than in aesthetic rationalities. Now you made me want to go and browse your portfolio so that I can escape into Universe. I'll do just that. |
|
| Photographer found comment helpful. |
|
|
04/07/2008 12:33:28 AM |
I want to guess...is it the constellation: "Pleiades"?
Very beautiful. It's hard to believe that there is that much reddish/pink color in the deep sky like this. Very cool shot. -BB |
|
| Photographer found comment helpful. |
|
|
04/06/2008 09:08:41 PM |
| Can't wait to see how many overlays you did. ;) Good shot. Knowing how hard these are to get...I'm giving a high score. Most can't appreciate the difficulty in this shot. Just curious if you used photoshop for stacking or another astro software package. |
|
| Photographer found comment helpful. |
|
|
04/06/2008 04:06:00 PM |
This is awesome - must be a nebula. I have no comprehension how to photograph something like this.
In my opinion the frame is superfluous and limits the beauty of the shot. That aside: 8 |
|
| Photographer found comment helpful. |
|
|
04/05/2008 09:23:37 PM |
| This is Jjanoue I assume? You did it again, you have taken a wonderful shot here, great find. I am curious, is this the plaidees cluster, or Lyra system? I like that border too. 9 |
|
| Photographer found comment helpful. |
|
|
04/05/2008 03:45:54 AM |
|
| Photographer found comment helpful. |
|
|
04/04/2008 11:10:30 AM |
| Very nice image of the Rosetta Nebula. I would have deepened the colours even more. |
|
| Photographer found comment helpful. |
|
|
04/04/2008 10:19:41 AM |
| Awe inspiring! Nicely done! |
|
| Photographer found comment helpful. |
|
|
04/04/2008 05:20:53 AM |
|
| Photographer found comment helpful. |
|
|
04/01/2008 10:49:28 PM |
| And the twinkle to boot, AWESOME capture !. |
|
| Photographer found comment helpful. |
Home -
Challenges -
Community -
League -
Photos -
Cameras -
Lenses -
Learn -
Prints! -
Help -
Terms of Use -
Privacy -
Top ^
DPChallenge, and website content and design, Copyright © 2001-2024 Challenging Technologies, LLC.
All digital photo copyrights belong to the photographers and may not be used without permission.
Current Server Time: 04/25/2024 11:35:18 AM EDT.
Add photograph to your favorites
Add photographer to your favorites
