Quote:
Originally Posted by Stefan Buda
I'm not a DSO photographer eighter so I'm not sure what all the red nebulosity represents, but the bright star towards the top middle of the image has a lot of red stuff around it, while on the other image it has none, and just a bit lower, both images show an equally prominent red cloud. How is that possible?
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I am confident that the red nebulosity is supposed to be h-alpha emissions.
(neutral hydrogen would be undetectable with a H-alpha filter)
The Ha-halo around also disappears in the second image.
While I suspect the OIII data is likely to be real (i.e. verifiable) in this case
I have serious misgivings about the veracity of the red regions being ultra faint "h-alpha" emissions.
No doubt other amateurs with wide-field fast instruments will re-visit this space with uber-deep images in time