M22 Great Sagittarius Cluster Southern Hemisphere

[Startrek]

Captured M22 Great Sagittarius Cluster for only the second time using a cooled OSC camera under City Suburban Skies

Southern Hemisphere
Bortle 8 Skies
50% Waxing Moon
Seeing average
6” f6 GSO Newt
Skywatcher EQ6-R pro mount
ZWO2600MC cooled to -10C , Gain 100
TS Optics GPU coma corrector
No filters
45 x 90sec dithered guided subs
40 x Flats
60 x Bias
PHD2 Multistar guiding ( 0.55 to 0.65 arc sec error total )
Stacked in DSS
Processed in Startools V1.8 OSC Linear Data Set

SV Decon worked beautifully on the globular cluster to tighten up Star field and remove atmospheric blurring Binned 71% preset , 24 x samples , 17 x17 sample area

Colour Scientific/ Straight

Original frame version
Crop frame version
Super Crop frame version

Comments welcome
Thanks

[Mike in Rancho]

Nice, Martin!

-23 DEC, eh? That's reachable, though I might have to move the mount to a different part of the yard.

I like the original full size best.

Interesting names you give your images. Unless it's secret code or you speak in hex?

[Startrek]

Thanks Mike,
I didn’t make up the name , Stellarium has M22 labelled as Great Sagittarius Cluster ( I just added Southern Hemisphere as I wasn’t sure you northern guys would see this object )
What I’m really stoked about is SV Decon worked tremendously well on this glob. It’s really hit and miss with SV Decon , some Binned objects work ok , some don’t , even using the same image scale and this can vary from object to object
What I have found is that good samples and plenty of them spread across the whole image produced a better result ( easier said than done )

Clear Skies
Martin

[Mike in Rancho]

Oops Martin, my bad for not being clear in my silliness.

Indeed there are some Great clusters out there -- Hercules, and now Sag, which I didn't even know about.

But I meant your filenames, shown below the image.

[Startrek]

All good Mike
By the way I did try SV Decon Alt Stars
Hmm…. No so good
Back to using extra sensitive Apod mask

Cheers
Martin

[admin]

Lovely image of this cluster Martin!

What I have found is that good samples and plenty of them spread across the whole image produced a better result ( easier said than done )

Hopefully, when 1.9 is finished, grabbing good samples will be the opposite; easier done than said.
I've been working on making sample setting a lot quicker and easier, automating sample size detection, generating more relevant apodization masks (with better rejection of poor samples), while also lifting the requirement that samples need to be "isolated".

Your (and others') feedback and sharing of user experience has been instrumental in this, and is much valued and appreciated.

[Startrek]

Thanks Ivo,
SV Decon worked exceptionally well on this Glob , not so well on other images, obviously due to a range of things like quality of data , noise ,sampling , binning which are all related and Stars that are immersed in bright nebulosity like in the core areas of M8 and so on …….
Any improvement would be well received
Looking forward to 1.9 when it’s eventually tested and completed

Clear Skies
Martin