Quote:
Originally Posted by marco
Unfortunately the main problem is the natural skyglow, despite the location I am shooting from is very dark and free from light pollution, the natural skyglow on large field has different color response as you get closer to the horizon. In other words, on a 12 degree per side FOV you have different colors of the background and, since the altitude of the object changes during the exposures and not all exposures were take with the object in the same alt/azimuth location (not even during the shots using same filter) when you sum up the image and stretch a lot you get always the background not completely even..
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Yeah.. that's the problem I ran into with my Rho mosaic, both with the 200mm lens and the QHY9 on the Tak E160. At least I know you haven't found any magic solutions
I resolved next time to shoot the colour subs much higher up and not shoot anything as low as I did (I went down to about 30 degress altitude). The panorama stitching in CS5 is *much* better than previous versions for star stuff and did a good job with the 200mm lens shot, but will have to give the Gradient Xterminator thing a shot too.
cheers
Phil