Following on from Bert's excellent image, here's mine.
Bicolour with Ha mapped to red (2 hours), OIII mapped to blue (5.75 hours) and a composite used for the green channel. This nebula is really quite dim, some of the OIII from last night are smoke or haze affected, might get some more data if it clears tonight.
Hi Stuart,
Nice image.
The stars are very slightly elongated -
maybe a guiding problem?
Yes - last night had a brown haze from all the smoke.
cheers
Allan
You know Al, I was looking at this this morning, I also thought this, then I blew the image up and put my reading glasses on and they looked round again. I was going to go to the optometrist to get checked out for astigmatism. I've been thinking I've been a bit astigmatic for a little while now, old tired eyes, makes it hard to judge when things are right, particularly when focusing. If they are out of round it'll be a registration problem.
Can anyone confirm that the stars are elongated up and down in the image? Preferably someone with good vision.
Can anyone confirm that the stars are elongated up and down in the image? Preferably someone with good vision.
Cheers
Stuart
I had a look at the full rez version on Astrobin , the stars are ever so slightly enlongated vertically, more noticable in the smaller stars. But geez! I reckon that's getting really picky (on my part).
You've been pumping out some great images lately Stuart
I had a look at the full rez version on Astrobin , the stars are ever so slightly enlongated vertically, more noticable in the smaller stars. But geez! I reckon that's getting really picky (on my part).
You've been pumping out some great images lately Stuart
Maybe I was too picky -
it's too hard to tell without the RAW data so
it's not a problem.
Excellent version of this object.. different to but as far as a pleasing look goes, pretty much on a par with Marco's amazing version last year, shows how the same object can be imaged and processed in two quite different ways and a fine pleasing view can still be had I too could see the elongated stars though..but I agree, it's not an issue and doesn't stop it being a show stopper.
(One odd thing - the star halos don't seem to be perfectly centred on the bright stars - any idea why?)
Thanks.
The reflections are not axisymmetric because they arise not on the imaging axis. I have found a couple of research papers on removing them, but none really explain why they aren't symmetrical about the star.
Someone here with more optics knowledge than I can explain it I'm sure.
Excellent version of this object.. different to but as far as a pleasing look goes, pretty much on a par with Marco's amazing version last year, shows how the same object can be imaged and processed in two quite different ways and a fine pleasing view can still be had I too could see the elongated stars though..but I agree, it's not an issue and doesn't stop it being a show stopper.
MIke
Hi Mike,
Even got some star colours in there for you, they aren't correct, but hey, it's a start!. I had a look at Marco's image, it is great, I need darker skies. I'll certainly add some more imaging time to this one (one, to fix the elongated stars, two to get more detail in the nebula, but it's going to be hard to compete with Coona for dark skies.
Quote:
Originally Posted by atalas
Love bubbles in Space! great job Stuart.
Thanks Louie, you can take credit for at least some of this one, I've been using (and probably abusing) some of you processing techniques that you have made tutorials for, I love them, they are great.
...consistently excellent images. 
