It's an HDR (high dynamic range) photo - which combines two or more exposures. You are right when you say it can't be done with one shot, but most astrophotographers do this now because that's what sells - it more realistically captures what the eye can see (and with some aurora photos, more than we can see - is that 'faking' it?). However, the 'painted' edges happen with certain techniques and software. Some people like HDR, some find it jarring. Janet White SnowMoon, LLC SnowMoon Photography .com The problem, with this photo is that it has no similarity to what the eye sees, at all. Like Grover I have seen many auroras from here and many other locales, The night must be moonless for pix, and on these nights the terrain stays black. And you don't see 9th mag stars, ever. I am aware of stacking 'negatives' for deep sky objects, but this effort is awful. It is like a nice poster I saw of the golden gate bridge with a big full moon. But since it was facing north, it was impossible and looked crappy, Paul Strasser -------------- next part -------------- An HTML attachment was scrubbed... URL: </geyser-list/attachments/20121019/f20d5623/attachment-0001.html>