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M51 Whirlpool (NGC5194 and 5195) LRGB total 5 hours on 2010.04.04 and 05. 12.5" RC, STL11000M. Alistair

M51 Whirlpool (NGC5194 and 5195) LRGB total 5 hours on 2010.04.04 and 05. 12.5" RC, STL11000M. Alistair

From: Wycombe Astronomical Society Members (Sat 10 Apr 2010 03:33:05 PM CDT)
Nice one Alistair, I can see colour in my future..
Was there a previous version with a magenta cast?
Chris
From: Wycombe Astronomical Society Members (Mon 12 Apr 2010 01:49:01 AM CDT)
Hi Chris. This is my third go at M51 - previous ones not much good and I can't remember if I posted them. But "magenta cast" sounds plausible! Recently deleted a lot from the gallery because it wasn't my better stuff and it had been there long enough.
From: Wycombe Astronomical Society Members (Mon 12 Apr 2010 01:56:34 AM CDT)
Such long exposures are vastly more resilient to noise appearing in the processing. Which is stating the obvious, but long nights of patience in the image acquisition has its rewards. Also got several hours of M101 and M63 this week. A
From: Wycombe Astronomical Society Members (Mon 12 Apr 2010 02:00:43 AM CDT)
I didn't spend much time on this and am sure I can get more out of it. I'll have another go when I get back to UK. A
From: Wycombe Astronomical Society Members (Tue 13 Apr 2010 03:38:29 AM CDT)
What a lovely image Alistair. Please can you explain the settings in more detail for me as I don't understand some of it. 05.12.5" RC,STL11000M please? Is this taken with a new piece of kit? i.e. Richey Cretien 'scope.
From: Wycombe Astronomical Society Members (Tue 13 Apr 2010 03:38:55 AM CDT)
Sorry should have signed off the last post with my name.

Jan
From: Wycombe Astronomical Society Members (Tue 13 Apr 2010 04:47:42 PM CDT)
Hi Jan, this is 5 hours of total exposure time over two nights, 2010.04.04 and 2010.04.05. Sub-exposures were 10mins each: 16L 4R 5G 5B unbinned. Plus darks, bias and flats.
From: Wycombe Astronomical Society Members (Tue 13 Apr 2010 04:58:33 PM CDT)
Camera is SBIG STL11000M 11Mp monochrome operating at -35C. Scope is RCOS 12.5inch f/9 RC mounted on AP GTO1200. Image processed in MaximDL and Photoshop.

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