This is a relatively dim target and this data is from a Telescope Live datasset that spanned from December 2020 to November 2022.

My previous effort was with my rig when it was an OSC + Antlia Dual NB OSC filter.  I still want to get "MY" data with my current narrow band rig; for starters my is a bit smaller FoV thant he Telescope Live images, so I feel like I should get a little be more detail.

The Telescope Live dataset is a relatively wide field view, so the surrounding nebula/clouds come out to play.  In most images these clouds are almost invisible or not present (see my previous post of this target).  However, with this widefield dataset, they start to become prominent as the image of the nebula is enhanced since they are only slightly dimmer to begin with.

This brings me to an issue I have in processing this image that I have not found a successful solution to and that is an issue involving Udra, the bright star within the nebula.

It is not a halo issue, or least not one like I've seen before, and it becomes quite prominent depending how I process the image.  Instead, I'm getting a red cloud or mist (for lack of a better word) that spreads primarily to the right of Udra in the image.  Oddly, it is not detectable with a red color mask script until processing has made it quite prominent.  It is not evident in the S2 images (which contribute nothing to the nebula) and there is only a very very faint hint of it in the Ha master.  When I say faint, it takes a double stretch to see a hint of it.  I'm performing all the nebula processing in a starless frame created after a SHO channel combination, SPCC, BXT, of Ha, S2, O3 masters.  The star frames are used to create RGB stars with a pixel math algorithm.  The red blur/mist is not visible in the stars only frame.

That is another reason I still want to image this target myself if weather ever cooperates; I want to see if this issue is isolated to this older CCD dataset.

I"m sure that there is a technique for isolating/removing this and not leave artifacts behind (or to not have it to start with, which is better).  I'm hoping someone here has some recommendations/techniques or give an example of the processing steps and outccome.  

One additional item of note.  A application of DBE after the final image was assembled did wonders for it.  I don't know that this would be a positive on every image, but it was on this one.

If anyone is interested, I can post the starless full frame version that shows the full extent of the nebula/dust cloud around this object. 

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From WikiPedia:

Sh2-308, also designated as Sharpless 308, RCW 11, or LBN 1052, is an H II region located near the center of the constellationCanis Major, composed of ionised hydrogen.  It is about 8 degrees south of Sirius, the brightest star in the night sky. The nebula is bubble-like and surrounds a Wolf–Rayet star named EZ Canis Majoris. This star is in the brief, pre-supernova phase of its stellar evolution. The nebula is about 4,530 light-years (1,389 parsecs) away from Earth, but some sources indicate that both the star and the nebula are up to 5,870 ly (1,800 pc) away.  Yet others indicate the nebula is as close as 1,875 ly (575 pc) from Earth.Sh2-308 surrounds the Wolf–Rayet star EZ Canis Majoris, also designated EZ CMa or WR 6. Its apparent magnitude varies from 6.71 to 6.95. Its spectral type indicates that the star is very hot and luminous. The spectrum shows that it is devoid of hydrogen at the surface. Canis Majoris is expected eventually to explode in a supernova, therefore subsuming the nebula.

The nebula was formed about 70,000 years ago by the star EZ Canis Majoris throwing off its outer hydrogen layers, revealing inner layers of heavier elements.  Fast stellar winds, blowing at 1,700 km/s (3.8 million mph) from this star, create the bubble-shaped nebula as they sweep up slower moving material from an earlier phase of the star's evolution. The hydrogen composing the nebula is ionised by intense ultraviolet radiation.  The nebula is approximately 60 light-years across at its widest point. 

The most favorable period for observing the nebula in the night sky is between the months of December and April. Its southern declination makes it easier to observe from the Southern Hemisphere, though it is easily visible from most of the Northern Hemisphere as well. It appears as a faint cloud in photographs taken with high-power amateur instruments, with the help of special filters.