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This has been a bit of a project. Last year I worked out that my 200mm Canon F2.8 lens and ASI1600 would frame the whole of the Veil complex quite nicely. I captured Ha and OIII data for the east and west nebulae with a Tak FSQ 106 and added this into the widefield image. Although the Tak data had to be shrunk down it did add a bit of extra resolution where it was needed.
The difficulty for me has been the processing. I have found it really difficult to tease out the faint wisps of detail and have tried the usual routines of micro contrast adjustments using curves along with Scott Rosen's Screen blend/mask inversion method but the results weren't great owing to the close proximity of faint and bright nebulosity. I'd heard about the PI process tool for removing stars, Starnet, so loaded this and had a rare foray into PI. This proved very helpful. It was a luminence created from Ha and OIII using the 200mm lens with the Tak data mixed in. Then the starless layer was added in PS with the screen blend mode at 50% opacity. The nebulosity detail was so well preserved I didn't need a mask. After blending I reduced the stars a bit more using the starless layer again and darken as the blend at 50%. I should really unleash some of the stars to add a bit of "punch" but I've wrestled with this data enough for now! I plan to use it further as I look deeper into the Gorgon that is PixInsight!
Telescope: Tak 106 for E and W veils. Canon 200mmL lens
Camera: ZWO ASI 1600 pro mono cmos, Gain 150, offset 50
Filters: Baader 7nm OIII and Ha
E+W Veil 10x30 mins each channel for each nebula. Whole complex 50x5mins for each channel
Captured with SGP, calibrated, aligned and combined with PI, processed mainly with PS but PI for Starnet. Ha mapped to red and OIII to both blue and green
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!
By LR Watanabe
I’m looking to do Milky Way Astrophotography, and I’m hesitating on whether I purchase the Full Frame camera that is the 5D Mark II or the APS-C EOS 600D.
I plan on using the Rokinon/Samyang 14mm F/2.8 wide angle lens, although I’m open to suggestions so long as said suggested lens is under 500$.
The mount I use will be the iOptron SkyGuider Pro with the counter weight supplies in the set.
If there is an alternative to the cameras listed above that goes for less then 400$, I’m willing to hear it.
Thanks a bundle,
Last week on august 5th we were treated to a coronal hole followed by some G1 auroral activity here in New Zealand.
Unfortunately I live a bit too far north to capture the spectacular Auroral images.
However, ever the optimist, I set my canon 6d with a Samyang 14mm lens up in my backyard and captured 300 or so shots (20 seconds at iso 3000) which I then sent through to lightroon timelapse.
I'm quite pleased with the result. Definitely some colour there.
Ladies and gentleman,
Thank you for helping me in advance.
As a kid I've always been fascinated with the sky and what was in it. The nights sky is filled with beautiful stars and nebulae and I want to see them for myself and be amazed how insignificant we really are compared to this vast open space. So let me adress some of the key points that I want for a first scope.
1. Around €1000
2. Big aperture, I want to see as much as possible and as far as possible while not losing a clear image
3. I would like to have a push to or go to system
4. Beginner friendly
5. Size is not a problem
8. I prefer reflectors since it seems they give more aperture for the money but if you know a better scope that sees more with less aperture let me know
9. I have a Canon 550D and maybe I could use this for a bit of astrophotography. This is last on the list tho and can be scrapped if the first 3 points aren't met
Of course build quality is very important when making my choice so keep that in mind as well.
I'm looking forward to you guys advice.
Happy stargazing and clear skies!