Hi Patrick, By coincidence, somebody on the SBIG discussion group just asked if it's OK to do color imaging when the moon is full. The answer from one of the experts was, not really except for practice. The reason is that the moon lights up the atmosphere, like sunlight does, rendering it bluish. I suspect it throws off color balance badly. In fact, I think we can see moonlight lighting up part of the sky in the clear image. I tried several times and couldn't get the color right. The best was without using the clear image. The next best was when I cropped the right side off of the clear image. But it still doesn't look quite right. Best wishes, Joe --- On Mon, 6/28/10, Patrick Wiggins <paw@wirelessbeehive.com> wrote: From: Patrick Wiggins <paw@wirelessbeehive.com> Subject: [Utah-astronomy] M-57 project pix To: "utah astronomy utah astronomy listserve" <utah-astronomy@mailman.xmission.com> Date: Monday, June 28, 2010, 2:44 AM After doing a bit of work on my imaging setup I dashed off 16 one minute, unguided shots of M-57 to make sure I got everything back the way it's supposed to be. 10 were with the luminance (clear) filter. 2 each with the red, green and blue filters. After reducing all I combined them into individual color sets (1 clear, 1 red, 1 green and 1 blue). I then zipped the four images into a file called M-57.zip and posted it here for folks here to play with. http://users.wirelessbeehive.com/~paw/temp/M-57.zip (about 4 MB) I'll be interested to see what y'all come up with. My attempts resulted in the nebula looking pretty good but the stars all had a pink tint. Have fun, patrick _______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://www.slas.us/gallery2/main.php Visit the Wiki: http://www.utahastronomy.com