Several years ago I shot the Rosette Nebula
www.flickr.com/photos/terryhancock/5261425439/in/set-7215... using a Canon 5D Mark II DSLR following repair by Canon who had mistakenly removed the Baader UV/IR Block (which increases the sensitivity to hydrogen Alpha) and replaced with the stock filter. HII regions within the nebula are so powerful that they tend to dominate most Wideband color astro images with a resulting RED nebula, by not having this filter installed at the time of shooting the resulting image showed the blue emission nebula (caused by the young stars exciting the atoms within the nebula).
I liked the look it created which was purely by accident and I wanted to try to replicate this look using my new data. This was achieved in my color image by "channel swapping" replacing the blue channel with OIII data and combining OIII with the green channel at 50% opacity and adding H-Alpha to the red channel.
Total Exposure time 9 hours
All my other and older versions can be seen hereAll exposures un binned (1x1)
Luminance 30 min 6 x 5 min bin 1x1
H-Alpha 120 min 4x30 min bin 1x1
OIII 120 min 4x30 min bin 1x1
SII 120 min 4x30 min bin 1x1
RGB 150 min 5 x 10 min each bin 1x1
QHY9M monochrome CCD cooled to -30C
www.astrofactors.comThomas M. Back TMB 92SS F5.5 APO Refractor
Paramount GT-1100S German Equatorial Mount (with MKS 4000)
Image Acquisition Maxim DL
Stacking and Calibrating: CCDStack
Registration of images in Registar
Post Processing Photoshop CS5
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