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Originally Posted by jase
Top work Eddie. Yes, you did cook it for a while to bring out the fainter nebulosity, but it hasn't compounded the overall majestic feel of the scene.
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Thanks Jase
Well you know getting a new take on something that has been imaged a gazillion times is never easy. Seeing more than usual in an image always has appeal to me. Thats one of the appeals of mosaics. To go wider and with greater resolution than possible with a shorter lens, for example...
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Certainly some interesting features present. Is the subtle blue hue in the dark dusty features natural i.e. reflection neb or an issue with the data (gradient)? Looks like it needs some further contrast there??
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Well your welcome to try! If I were to give you the raw images you might be surprised. There is a great deal of lighter material covering the lower part of the image. I've imaged this same area for about 12 hours all up with two different camera orientations and on half a dozen different nights, the result is always the same. The Coalsack appears to have a very lightened region just below its visible dark top, which is obscuring the stuff within. It's not pitch black and completely obscuring like the area above it.
The interesting thing is that this does not appear in wider images. The Coalsack itself looks pretty much uniformally dark in this area. I pained over this detail for quite some time and its even visible in the Crux Mosaic. It is in all my raw images, but really doesn't become prominent until many are stacked and the SNR increases significantly.
Also, while I was doing the mosaic, there was some crossover of images in the Coalsack, and it appears in the same place in different corners of different images. So, being somewhat convinced that its real, I left it in there rather than contrast enhancing just this part of the Coalsack to remove a feature that is quite possibly real. One of those processing choices that we all must make along the way I suppose!
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A very spectacular view of this region, something I've not seen presented in this manner before. Well done.
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Thanks Jase! I hope to get the entire Coalsack like this, so perhaps that will place this brightened area into a more understandable context, visually.