NGC6188 HaOiiiOiii

[multiweb (Marc)]

Originally Posted by 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?

Thanks Troy. 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.

Originally Posted by Ross G

Great shot Marc.

Such depth, it looks 3D.


Ross.

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

Originally Posted by TrevorW

Nicely done Marc

Thank you Trev.

Originally Posted by strongmanmike

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

Marathon imaging there mate, well done

Mike

Thanks Mike. Possibly but not mirrored.

[Hagar (Doug)]

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 (Marc)]

Originally Posted by John Hothersall

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

John.

Thanks a lot John. 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.

Originally Posted by 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.

Thanks Greg. 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 ). 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 (Marc)]

Originally Posted by 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.

Thanks Doug. 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 (Fred)]

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 (Marc)]

Originally Posted by 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.

Thanks Fred. 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 (Troy)]

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

[multiweb (Marc)]

Originally Posted by troypiggo

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

No worries. Glad you made any sense out of my rambling . 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. 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.