halli Posted May 11, 2016 Share Posted May 11, 2016 Hi Didn't know how to introduce Ha into RGB but found a script in Pixinsight called NBRGBC combination that was easy to use and introduces it into the red channel. The result is shown below. It also allows the introduction of Oiii into either the Green or Blue channel. I find this concept quite attractive as it allows the best of both worlds to help with star colour etc. But Im sure there are the fors and againsters. I am suffering some coma in top right despite the use of a CC - think its to do with chip/focusser orthogonality but thats just a guess ! I think the spacing is OK Anyhow I would love to hear what you think Link to comment Share on other sites More sharing options...
laser_jock99 Posted May 11, 2016 Share Posted May 11, 2016 Nice. Any exposure information? Link to comment Share on other sites More sharing options...
halli Posted May 11, 2016 Author Share Posted May 11, 2016 Thanks for your comment Laser I took around 32 x 1000s light frames and about 16 x 600s each of R,G, and B using a 130pds and a 383l with Baader filters Link to comment Share on other sites More sharing options...
laudropb Posted May 11, 2016 Share Posted May 11, 2016 Very nice image. Link to comment Share on other sites More sharing options...
toxic Posted May 12, 2016 Share Posted May 12, 2016 very nice Halli i think your collimation may be slightly out as it looks like the focus is just not as good as the rest of the pic i had a similar problem with my 200pds and it was caused by my focuser not being plumb so it made my secodary out and the primary hope that helps Link to comment Share on other sites More sharing options...
halli Posted May 12, 2016 Author Share Posted May 12, 2016 Thanks for the comments luadropb and Chris. I will definitely check the collimation but as you suggest the focusser probably needs attention as well Link to comment Share on other sites More sharing options...
symesie04 Posted May 12, 2016 Share Posted May 12, 2016 very nice. Star colours look real nice. Link to comment Share on other sites More sharing options...
halli Posted May 12, 2016 Author Share Posted May 12, 2016 Thanks symesie04 Link to comment Share on other sites More sharing options...
ollypenrice Posted May 12, 2016 Share Posted May 12, 2016 It's good. I prefer to add narrowband to RGB in Photoshop. I add Ha to red in blend mode lighten and save it as a layer. Then I add OIII to green in blend mode lighten and save that an layer on top. Finally I add OIII to blue in blend mode lighten and that makes a third layer. By adjusting the opacity in the two upper layers you can see the effects of OIII in blue and in green, and this is the key adjustment in my view. Olly Link to comment Share on other sites More sharing options...
halli Posted May 12, 2016 Author Share Posted May 12, 2016 Thanks for the information Olly. Unfortunately I haven't got Photoshop but its interesting that you add OIII to both blue and green channels, I believe the PI script I referred to offers the same functionality with the ability to scale the amounts of NB you can add. I guess the results probably equate to the Photoshop method. I suppose the main issue is collecting enough broadband and narrowband data with the UK weather ! Although the ability to collect NB data with the moon about certainly helps ! Link to comment Share on other sites More sharing options...
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