Atik Cameras Forum
Images => Deep Sky Images => Topic started by: NielsVChr on March 19, 2018, 09:52:22 pm
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Galaxy M51, as said a LRHaGB Picture, raw frames/subs taken 18->19 March-2018.
More info. about the shown/below galaxy picture can be seen here, (and in higher resolution), thanks.
https://astrob.in/338085/0/ (https://astrob.in/338085/0/)
FYI,
https://www.cloudynights.com/topic/611811-m51-galaxy-a-lrhagb-picture/ (https://www.cloudynights.com/topic/611811-m51-galaxy-a-lrhagb-picture/)
Kind regards Niels
(http://dl.dropboxusercontent.com/s/4yb3apat8t9v6np/M51-LRHaGB-PictureFinal-Lrgb1000Web.jpg?dl=0)
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Hi Niels
Very nice!
Puts my to shame that I posted on March 11th. My problem is I need to add guiding, also I never tried adding Ha to an LRGB image. A few questions:
1/. How long was each frame for each filter and how many frames taken for each filter
2/. What software was used to process?
thanks
David
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Hi David. Thanks a lot.
From link info. Copy & Paste info.
Raw frames were taken like this. LRGB=62,28,28,28 all 120sec exposures. Ha exposures=10x300sec.
Remote setup used,
https://astrob.in/338099/0/
I used ccdstack2 and Adobe Photoshop CS6.
CS. Niels
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Hi Niels,
Your M51 is just beautiful! So much detail and fantastic colours. Great job!!
Thanks a lot for sharing it with us :)
Iria
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No problem & thanks a lot Iria 😊
CS. Niels
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Beautiful result!
bwa
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Thanks Niels
I usually take about 16-20 frames per color so I wonder what difference more makes?
David
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Thanks a lot for comments!
David.
Not sure I understand your answer/question correct, but ... .
The short answer, the more frames you can get/take & when calibrated and stacked => generate more signal & less noise.
Well, due to the extremely bad weather we have had in cph Denmark lately it's always a challenge to get lrgb exposures enough to make a great picture.
Depending upon your camera specs.and how big/"fast" your scope is I always choose the lum/color frame exposure length so that the majority of stars don't saturate.
To get colors easily in stars & the target demand that fact.
Then it's just a matter of/to get the star guide feature to work. Sometimes it's a challenge to get perfect round stars, when the 16" scope focal lenght is around 2500mm.
Kind regards Niels
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Hi Niels
My 30'' focal length is 2667mm long so I agree about the star quality. I appreciate about better S/N ratio with more integrated frames, I hadn't realized more than 20 or 30 would make a bog difference but I'm going to try this.
Regards
David
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For you it's even harder to get the guiding to work, I would expect, so good luck David :-) CS. Niels
Note:
Hopefully you know that the improvement in S/N ratio is not a linear function, meaning I don't know in your setup how much improvement in S/N ratio you will get going from 20 -> 30 frames.
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Hi Niels,
I'll post some results trying different number of frames when the whether ''eventually'' goes clear.
David
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Sorry Niels,
Can't spell tonight, I meant ''weather''
David
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No problem, you can also choose to edit/modify your previously post :-)
Ok, please do/show these exposure differences, thanks David. CS Niels
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Very nice details !
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Thanks a lot! CS Niels
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Thanks a lot😊