Here is the L data. I was only able to get 12m R 12m G and 15m B before some light clouds were coming over the horizon so no color. I was fighting some high thin clouds coming in from the southwest all night and I am guessing those are the cause of the gradient in the L channel as well. It has been my experience with my setup that the slightest amount of clouds really screws up my color data which was why I quit.
I have posted a slightly smaller version of the L channel here and the full size image (only slightly larger) can be seen at:
http://www.frogpondobservatory.com/images/galaxy/ngc253.jpg
The image details are:
15 x 300s using C8/st237-fr237@f/4.? G11 gemini, guided with ST90/TV 2.5x powermate/st5c
MaximDL/CCD for imaging and processing (darks/flats/bias/ddp) and Photoshop Elements for levels and to try to minimize the gradient a bit. I applied a very light unsharp mask and thats it.
Back to the processing, clear skies,
Mark
I have posted a slightly smaller version of the L channel here and the full size image (only slightly larger) can be seen at:
http://www.frogpondobservatory.com/images/galaxy/ngc253.jpg
The image details are:
15 x 300s using C8/st237-fr237@f/4.? G11 gemini, guided with ST90/TV 2.5x powermate/st5c
MaximDL/CCD for imaging and processing (darks/flats/bias/ddp) and Photoshop Elements for levels and to try to minimize the gradient a bit. I applied a very light unsharp mask and thats it.
Back to the processing, clear skies,
Mark
Attached Image:
