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I too was very upset. Spent the weekend in the woods with family out of cell service. I have several apps that let me know when Northern Lights have the potential of showing. I've spent many hours standing around in the cold and the wind (seems like winter is the best time of year) trying to get some pics. I have a few OK pics but nothing like in this thread. Saw on the Yellowstone FB page that they saw them too. Some pretty cool pics of YNP scenery with Northern Lights.
That is awesome, if you do not mind me asking what was your setup to get a shot like that?