NGC6188 HaOiiiOiii

[multiweb]

I did a lot of Oiii over three nights this week. 68x10min. Tuesday, Thursday and Friday so a bit over 11h.

I got very good seeing Friday from 2:00am onwards. Thursday was average and Tuesday not too good. All nights were very wet though especially Friday.

Still managed to get tight stars and not much bloating. I have a long way to go to do the other panels but this one is done and blended with the corresponding Ha.

There's a bigger version here (http://public.bay.livefilestore.com/y1pKCFcwn8VHWBqLvZu2WPKlPlDObNA7ZIp C42qJ1JwRpAEY-zkrC76hFnuC057VAVMoJK8_JKfwLSJ1AjIj YIN9g/NGC6188_HaOiiiOiii_bf.jpg?psid=1)(1 934x1280) which is approx 60% - [2.75MB].

The blend turn out ok I reckon. I like the blues so I pushed them a bit. Personal preference. :P

Thanks for looking. :thumbsup:

[Octane]

That. Is. Awesome.

WOW!

If I could add that to a favourite images list, I would.

H

Edit: the link you've posted is asking me to sign in with a Windows Live ID. Is that necessary?

[DavidU]

Well done Marc. Superb.:thumbsup:

[allan gould]

Marc that's a real stunner. A great image and really well composed.

[multiweb]

:doh:Thanks H. Should work now to see the big view.:thumbsup: I must have copy pasted the link while being signed in. Weird. :question:

Thanks David. :thumbsup:

[multiweb]

Thanks Allan. :thumbsup: It's part of a mosaic so the framing was not important. I just registered it to the Ha scaffold (http://www.iceinspace.com.au/forum/showpost.php?p=720876&postcount=1). That's the full frame of the CCD.

[renormalised]

I agree with H, that is an exceptional image:):)

I like the blues too...fav' colour, actually:)

[RobF]

Very well executed Marc.
Congrats on a real keeper.

[marc4darkskies]

You should be really pleased with that Marc! It's a lovely image! 680 mins of OIII is a lot of data and a big effort - and it's paid off!

Looking forward to seeing all the panels done to the same standard - it will be a killer mosaic!

Cheers, Marcus

[Lester]

Wonderful image Marc, thanks for the view. All the best for more.

[peter_4059]

Very nice detail Marc. 11 hrs is wuite a committment for the first panel - how many do you intend to have for the whole image?. Looking forward to seeing the finished image.

[RobF]

Yep - we don't all have a "Sao biscuit" for a sensor....;)

[multiweb]

Thanks a lot Carl. :thumbsup: Blue's always the hardest color to get for me so I guess we crave what we miss.


Thanks a lot Rob. Glad you like it. :thumbsup:


Thank you very much marcus. :thumbsup: Yes it was painstaking with a small aperture. But I want to make sure the final is not overwhelmed with green Ha when I use the proper palette.


Thanks Lester. :thumbsup:


Thanks Peter. :thumbsup: I think 4 or 5 will cover the area. Then I have to do Sii which is going to take probably longer than Oiii. But Sii will be sharp. Oiii is the channel where you have to watch out for star bloating and you need good seeing and shoot close to the meridian.


:lol: With a big spread of mustard. ;)

[multiweb]

Thank you Allan. More to come. :thumbsup:

Thanks a lot H. :thumbsup: The full complete mosaic should be nice. Then I can go back to shooting M8 ;)

[troypiggo]

Thanks for showing me how it's done :) Wish the FoV was this wide for my shot.

Can I ask about the processing? How do you go about the Ha and the OIII? Do you play with the Ha first, stretch it etc until it looks like a good image in its own right? Then do the same with the OIII separately, so it looks like a good B&W on its own? Then combine them into the different channels?

[Ross G]

Great shot Marc.

Such depth, it looks 3D.


Ross.

[TrevorW]

Nicely done Marc :thumbsup:

[strongmanmike]

Coming along nicely Marc...don't recognise the field though :confuse3:..is it upside down..? :P

Marathon imaging there mate, well done :thumbsup:

Mike

[John Hothersall]

Splendid result and a huge amount of time which shows in the quality.

John.

[gregbradley]

A terrific image Marc. Very nicely done.

I also found early morning Sat had fantastic seeing. I saw around 1.2 arc secs on some of my images.

Greg.

[multiweb]

Thanks Troy. :thumbsup: Not showing anything mate. I'm just a n00b too when it comes to blends. Sometime they work, sometime they don't. Here's what I did for this one.

1_ As you've mentioned you stretch your Ha and Oiii as if they were standalone pictures, so you spread your dynamic range nicely to the limit noise will permit.

2_ You start an RGB file and copy paste the Ha in the Red channel, then the Oiii in the Green and in the Blue channels in PS.

3_ You then do a bit of noise reduction mostly in the blue channel and use curves and levels to boost it.

4_ Use saturation as well to get the colors popping out a bit more.

Then I combined the grayscale Oiii and Ha layers as a separate Luminance layer then set it to Luminosity. Then duplicated the underlying color on top of the lum as soft light. By doing this you boost the details in the color from the Ha mostly without affecting the colors too much. You set the lum opacity and the color softlight until you like what you see.

It's a lot of experimenting and different everytime with each different picture I find so it's a bit hard to explain. But that flow should get you started.


Thanks Ross. I might do a stereoscopic version when it's finished actualy. Good idea. :thumbsup:


Thank you Trev. :thumbsup:


Thanks Mike. :thumbsup: Possibly but not mirrored. :P

[Hagar]

very nice Marc. Lovely 3D effect on the 2 main layers of this nebula. Stars look good and boy what a large field of view.
Very nice ,Well done. You have to get yourself a mono camera.

[multiweb]

Thanks a lot John. :thumbsup: Some of the latest data from late Friday night/early morning was very good. I never got stars that tight in Oiii before especially across the whole field. I didn't apply any sharpening or deconv to any of the subs. They came out that sharp off the camera. I was very happy with the conditions I had while imaging. Terrific seeing, no wind. That made the whole difference.


Thanks Greg. :thumbsup: Yeah all of a sudden it got dead still. Every new sub coming in I was like wow! Something's wrong (but in a good way - usually it's my focus going south :P). This time my focus was getting sharper and sharper. Across an hour or so the FWHM dropped another 1 arsec then the clouds rolled in from the SW at around 4:00AM.

[multiweb]

Thanks Doug. :thumbsup: Well it's defnitely on my to-do list, get a mono. I want to get a smallish sensor with small pixels (smaller surface than the QHY8). I'm enclined to get something like a cylindrical shape that I could use with the hyperstar too. Maybe a starlight Xpress or QHY but I want something with a low noise SONY sensor, not a KODAK chip.

[Bassnut]

wow top effort Marc, 1 panel already so detailed, the mosaic will then be increadible. One little thing, the colour noise is not hard to reduce (I tried on this, easy), although in the final mosaic, it would be hard to see.

[multiweb]

Thanks Fred. :thumbsup: Not too worried about color noise as I will deal with that in the final mosaic. I put this panel together quickly too see what it would look like. But the final blend will be done simultaneously over the 5 stitched panels.

[troypiggo]

Thanks Marc. Tips noted and implemented. Happy with the results. :thumbsup:

[multiweb]

No worries. Glad you made any sense out of my rambling :lol:. It's hard to explain when you experiment stuff to make it work. I try to document everything I do because sometime I forget how I did it and I have to go back and read my own instructions. :P I'll try to make some videos about it. I did a couple for the ASNSW meetings that people seemed to understand but I haven't found a way to compress them enough to upload them and stream them.

When I do you'll be the first to know. :thumbsup: