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I scrapped all the Oiii and Sii data I previously took during a full moon (about 15 hours worth) and retook it all when the moon was a bit smaller at 76%. Ha was taken during 98% and 67% moon. All the lights were taken on the following nights: 12th, 19th and 20th September 2019.
Integration times, all in 600s subs unbinned:
Ha = 28.33 hours
Oiii= = 5.67 hours
Sii = 5.67 hours
The Ha data is really nice, and unsurprisingly the Oiii and Sii is not as strong (or nice).
I'm missing that (vital) step in my processing routine of getting the Sii and Oiii properly stretched to match the Ha, before combining. I dont really know how to deal with the weaker data properly. Any pointers would be appreciated.
What I do currently:
All the data is loaded into APP into separate channels/sessions.
The data is stacked and registered against the best Ha sub
This produces individual stacks of Ha, Sii and Oiii that are all registered
Each channel is processed with DPP in APP and then saved as a 16bit TIFF
Each is opened in PS
Stars removed with AA and any remnants removed and tidied up
I then open a blank RGB document in PS
I paste Ha into Green, Sii into Red and Oiii into Blue
Adjust the selective colour settings to get 'Hubble palette'
Adjust levels, curves, saturation until looks ok
All the Ha Sii Oiii data is then combined together in a single 'super' stack in APP using quality weighted algorithm to create a 'luminance'
That luminance layer is adjusted using levels, curves, and NC tools such as local contrast enhancement and deep space noise reduction (using masks to apply as required)
The luminance is pasted onto the above colour layer, and incrementally added using gaussian blur
Cropped and saved.
Here it is anyway I haven't intended on any more exposure time for this one, but will consider it, if the expert opinion dictates otherwise!
Hi still learning the ropes with my new Hypercam 183c pro
i took this image of the heart nebula the other evening, and now I realise I want a scope with a shorter focal length haha.
22x 240s stacked and calibrated in PI. Final touch up in PS 2018
SW ED80 DS pro with Altair light wave 0.8 reducer. Heq5 pro, Altair astro hypercam 183c pro. Guided.
@Stu, @GavStar and myself met up for a bit of club observing Thursday night… cloudy so good that we met down the pub. Someone (not sure who) pointed out it was clear, so we headed out to stand and chat under clouds with a chill breeze for more than 2hours waiting for the skies to comply with Sat24. Finally we spotted what looked like the edge of the clouds… the others got ready to polar align. OK observing under a near full moon is not ideal.. but it does help with setup and checking your charts!
So what to look for… using Gavins new “magic eyepiece” we headed straight for the Horsehead, just visible, the flame slightly more so above. We were using a TEC160 on a goto panther mount, with 55mm plossl and the TNVC adapter to the intensifier, using a 6nm hydrogen alpha filter to “help”. The gain control worked really well to tune the balance of brightness (and noise) vs detail. The “white phosphor” giving a very neutral and “natural” view.
Right, where next? Up to the jellyfish ic443, nice gentle curve easily visible, checked on the monkeyhead nearby. We then cruised down to the seagull which filled the view and then tried to ferret out the medusa Nebula… it evaded us this time. Swept over the the pacman, the heart and then the California nebula. The latter as two broad nebulous bands crossing the field of view. We need to try a smaller scope to give a bigger field of view for these really big nebulae.
Swapped in a longpass filter and checked on M35 which looked great, M3? and then M81/82, very clear dark lane in the latter.. Clouds finally made a return and we packed up the wrong side of 1am, feet nearly frozen solid. Seemed like many of the streetlights had turned off as well, which is interesting to note. Going to be fun to poke this setup at nebulae when the skies are a little bit more conducive to observing.