20211008 - IC434 / B33 Orion region, Horse’s head and Flame Nebula - Quick and dirty capture, with (L-)extreme nuisance. Any ideas?
What’s in the picture(s)
IC 434 / B 33 ORI Horsehead Nebula -
https://en.wikipedia.org/wiki/Horsehead_NebulaQuote “IC 434 is a bright
emission nebula in the constellation
Orion. It was discovered on February 1, 1786 by
William Herschel. The
Horsehead Nebula is a
dark nebula silhouetted against it.
The Horsehead Nebula (also known as Barnard 33) is a small
dark nebula in the constellation
Orion. It is located just to the south of
Alnitak, the easternmost star of
Orion's Belt, and is part of the much larger
Orion Molecular Cloud Complex. It appears within the southern region of the dense dust cloud known as Lynds 1630, along the edge of the much larger, active star-forming
H II region called
IC 434.
The Horsehead Nebula is approximately 1,375
light-years from Earth. It is one of the most identifiable nebulae because of its resemblance to a
horse's head”
What was the experience
That Friday, 2 weeks ago, I did a couple of try-outs at the end of the night, while clouds and morning glow started rolling in. Just to get a feel for some framing and exposure settings that would allow me to prepare for later this year., Image quality isn’t good, remember this is a try-out, preparing for later.
A (very-) quick capture of the Horsehead Nebula, not enough data anyway. But what is strikingly apparent, is the big star-halo that the L-extreme gives off, especially on the ‘fast’ TS94 f4.4. Recently I’ve noticed this on other images as well, when a bright stars is in the picture
I haven’t found a way in post-processing yet to smoothen this out. A couple of suggestions, like PI clonestamp, seem difficult in this nebulous area, besides I don’t want to alter the content of the image too much. Also tried with de-convolution, no luck, too big.
It seems the only way to counter this, is either going for shorter exposures, or changing the filter to L-Pro.
Anybody has any other suggestions how this can be solved? What’s your experience to solve or counter this?
How it was done
Scope: TS-94EDPH APO (FL 414mm / 517mm with 0.8x corrector)
Mount: SkyWatcher EQ6R-Pro
Camera: ASI2600MC Pro
Guiding: @zwoasi OAG, ASI290MM, ASIAIR Pro + dither (1image/5px)
Filter: Optolong L-Extreme
Resolution: 1,87”/pixel, FoV 235’
Moon: 6%(+), Bortle 5/6 SQM 19.60
Photons: Gain 100 -10c 300s 10x
Processing: PixInsight (Mac)
What have I learned from this
Although the L-extreme has been very helpful on other images, it causes a bit of a nuisance when bright stars are in the picture. Standard PI tutorials don’t give a hint on how to solve this. The only way to avoid this, is probably shorter exposures, or changing the filter.
Waiting for Clear Skies ….
Clear Skies everybody! 🤩✨🔭
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https://www.astrobin.com/users/WCA65/
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