About the Blog

This blog contains recent projects, activities, and musings about astrophotography and space, to view my main webpage with prints for sale, final images, and Annie's Astro Actions, please visit: www.eprisephoto.com


Thursday, December 5, 2013

Bringing out the dust

I finally got a chance to shoot the Orion Nebula for the first time since I started imaging. After months and months of clouds and full moons during the only clear evenings I got a perfect evening. By far the best skies I have had here at the house since we moved here 3 years ago. I have had the scope set for Comet ISON (which didn't make its trip around the sun) so instead of putting my regular configuration back on, I decided to use my Nikon D7000 to shoot M42. I did a variety of sub-exposure times to compensate for the high range of lighting in this region so have subs ranging from 60 seconds to 15 minutes with a total of 8 hours. Instead of going into how I layered all of those to get the detail from core to dust I want to show just how much dust really was captured.

I started off using my normal processing steps (i.e. stack, run through my Photoshop Action set, color correct, some manual stretching, possibly GradientXTerminator, a few other actions, noise reduction) I did these and then used a plugin I have and occasionally use for my normal photography business called Color Efex Pro. There are a few of the steps in there I have found useful for certain astrophotography targets so gave them a try. Using Detail Extractor, Tonal Contrast, and Pro Contrast I was able to tweak out a bit more of the dust and get a nice looking final image (you can see higher res on my website).

Now is when I started to play some more. I could tell there was more dust to be tweaked out, but was getting to the manageable limit of noise for a final image, but that doesn't mean I couldn't play just to see what was there! I did a few more curves and then brought the image over to my Windows PC where I have another one of the Nik Software suite, HDR Efex Pro. I ran it through there just to see how much of the range I could pull out and was amazed. Obviously the noise overran the image, but the amount of dust in this area was phenomenal. Especially as I had always assumed one needed 15+ hours on it to pull that kind of dust out (and probably would to do that and not have the noise at full size). 

Even in this small size, you can start to see all the noise but the dust still looks quite impressive. Amazing what an unmodified DSLR camera, modest telescope, mostly dark skies, and 8 hours of exposure can show that you just can't see when looking up at night!

*note: I do not get anything from the external companies or plugins I mentioned above. I just include them and the links to explain to other astrophotographers what tools I used and help them find them easily if they wanted to check them out. I am not intending on promoting them, more just to be thorough in my processing explanations. 

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Monitor Calibration

Monitor Calibration
The grayscale above presents 24 shades of gray from pure white to solid black. If you cannot see all 24, your monitor needs calibration to view the astrophotos correctly: I recommend the site linked in the image