OIII Stacking - Green or Blue?

[multiweb (Marc)]

Hi guys, tonight I'm shooting Eta in OIII. I had a quick look at the subs so far and I'm getting nearly as much signal in the blue and the green channel with my OSC. What do I do? Do I debayer to green and blue, align and stack everything in one or do I stack separately all the greens and all the blues then decide the one I'll be using in the final comp? Thanks for any tips.

[Bassnut (Fred)]

Id say whatever image you get is OIII filtered, so stack em as is, all the channels together and use the result as the Blue layer in PS later. I suspect you will have to convert it to mono before PS import.

Havent thought of this before with a DSLR (with NB), interesting to see if thats the best way, it would work anyway.

[multiweb (Marc)]

Thanks for the info. I might stack the green and blue channels separately at first for the rejection to work properly then stack the two masters together in one "blue". I understand the obvious advantage of normalisation for data rejection to work but I'm still struggling with colours. I usually try to go by the star colors and keep them "white". But I'm thinking now is it not better to tweak the ratios until the nebulosity is pleasing then make a star mask in PS and tweak the star colours and saturation there?

Anyway here's a quick preview of what I'm playing with. I go so far 5 hours of very good Ha, 4 hours of so so OIII from last night and 2 hours of SII which was taken three nights ago through sucker holes, so not great at all.

That was all acquired from my backyard. I want to capture loads of SII from Ilford next new moon week-end. The compo is LhaROiiiGHaBSii. So much to learn

[rat156]

Hi Marc,

Looks great so far.

The beauty of this is once you have the raw data, you can combine it anyway you want, just call it Marc's palette.

Unfortunately you can't do that with the English language. Contrary to what you computer tells you colour has a u in it, b*&^%$ Webster at fault there.

Cheers
Stuart

[troypiggo (Troy)]

Wow. You're still playing with it and that's the result so far!? Can't wait to see the finished result!

I've just received Ha and OIII Astronomic filters, the SII is back-ordered. Looking fwd to some of these type of shots.

Come to think of it, if anyone is reading this and knows about using these sorts of filters in imaging, any chance they could swing by my question posted here? Have had no responses so far. Not sure if I posted in the wrong section, if it's a stupid question, or if it's too hard to answer?

[multiweb (Marc)]

Thanks guys. I'll have to post it to the DSO forum when I'm done with it. I still need to get loads of SII for it. Last night was funny in Sydney too. I rushed out coz it's been raining all week and was hoping for a clear night but it was muggy and hazy from 21:00 onwards. I did 4h of OIII. Just let it run. Everything was ticking so I thought why not and went on to watch TV. I think I left it until 1:00am then packed up. First subs were ok, the rest a bit dodgy. I reckon too many high clouds. Tonight's no good either.

[multiweb (Marc)]

Originally Posted by rat156

Unfortunately you can't do that with the English language. Contrary to what you computer tells you colour has a u in it, b*&^%$ Webster at fault there.

I"m imported. My accent is even worse than my spelling.

[Bassnut (Fred)]

wow, now thats a nice pic, so smooth and detailed, never quite seen it like that before, supprising how different the colour is and still "appropriate"..

[jjjnettie (Jeanette)]

It certainly make you see old Eta in a new light.
It's beautiful!