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2nd attempt at the Rosette Nebula

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#1 Toxic Coolaid

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Posted 07 December 2012 - 03:47 PM

C49 shot from my driveway. My light pollution limited me to 120 seconds with the CLS filter. I had to estimate the framing because I couldn't see the nebula, and it pretty much fills the frame.

seeing 8/10 for a yellow/red zone
Sky-Watcher 80mm ED
60Da with Astronomik's clip in CLS Filter
CGEM guided with SSAG package
Stacked in DSS and processed with PS
with Troy's actions, Gradient X Terminator, Noiseware Professional

60 x 120 sec Lights
15 Darks
30 each of Flats, Dark Flats, Offset

Posted Image


Here is what each light frame looks like

Posted Image

#2 zjc26138

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Posted 07 December 2012 - 05:38 PM

Beautiful image!

#3 David Pavlich

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Posted 07 December 2012 - 06:17 PM

Nice work on one of my favorites!

David

#4 WhitenerJ

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Posted 07 December 2012 - 06:55 PM

Nice job!!! Really great that you got such a nice result.

I noticed your CLS filter does the same thing to your subs as my IDAS does. How do you go about figuring out the right exposure with multiple color spikes?

Jason

#5 Toxic Coolaid

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Posted 07 December 2012 - 08:04 PM

How do you go about figuring out the right exposure with multiple color spikes?


When I'm shooting at home I know 120 seconds will be near my max. I'll usually soot test shots at 3200 ISO, and I image at 800 ISO. So, 30 sec @ 3200 = 120 sec @ 800. I'll look at the histogram and try to keep the blue at about 1/3. You can see the histogram from the single sub on the bottom right of the AstroBin link. I can pretty much tell when I'm getting over run by LP just from looking at the camera image . Sometimes I can only get 60 seconds. If I have time to drive out to the dark, I'm good for 600 sec+

I really wasn't sure what I would get on the Rosette because the subs looked so bad, but I thought I'd give it a try. At the very least I'd get a star field to look at.

#6 Nils_Lars

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Posted 07 December 2012 - 11:08 PM

Some awesome details coming through , great work

#7 mmalik

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Posted 07 December 2012 - 11:38 PM

Well done; you could brighten it up a bit. Thx

#8 Toxic Coolaid

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Posted 08 December 2012 - 12:19 AM

brightened a bit. It's bringing the noise out quite a bit now though.

Posted Image

#9 jambroseus

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Posted 08 December 2012 - 08:08 AM

Great work for a light polluted site!!

John

#10 Maverick199

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Posted 08 December 2012 - 09:25 AM

Wow, thanks for posting the light frame, helps understand what to expect.

#11 Barry E.

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Posted 08 December 2012 - 10:01 AM

You really pulled a lot out of those light-polluted frames! And only 120s each makes it more impressive.

#12 mmalik

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Posted 08 December 2012 - 04:41 PM

It's bringing the noise out quite a bit now though.


You could try posting FIT if you would like folks to try. Plain brightening will introduce noise; there are other ways; DD, curves, etc. as you may know. Thx

#13 bouffetout

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Posted 08 December 2012 - 07:24 PM

Beautiful photo ! congrats !

#14 Toxic Coolaid

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Posted 08 December 2012 - 07:28 PM

I really need better conditions and better signal. What is the best way to post a DSS file? I use TIFFs, but either way. I'd be happy to see what can be done with it. I was very happy and surprised to pull as much out of the LP as I could. I hope to get a few nights in a dark location and give it another try.

#15 mmalik

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Posted 09 December 2012 - 08:09 AM

What is the best way to post a DSS file? I use TIFFs, but either way.


You could use this... if you have Hotmail/msn account to post your TIF/FIT. Thx

#16 Skyshooter

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Posted 09 December 2012 - 12:12 PM

Nice catch on the Rosette. It's amazing what can be done even from a yellow zone! Your framing problems plague everyone. I always have to take a couple test shots to nail the framing. Seldom do I see the object in the camera. I like the lighter one better of the two. Nice detail, good focus and composition. Gotta Love that!

Cheers,
Ed

#17 Toxic Coolaid

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Posted 09 December 2012 - 01:27 PM

Luckily the Rosette has the bright stars at it's core marking it's center. Of course that's why it's there. Most targets get cropped and don't need the perfect framing. I always use the good old Bahtinov mask. I had just cleaned and adjusted the Crayford focuser on the Sky-Watcher, and it made a huge improvement on fine focusing and focus lock. It's almost amazing those things even work, but they do.


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