This is Háteigskirkja church in Reykjavik, Iceland (don't try to pronounce that name -- you might hurt yourself!). The typical exposure settings when shooting the aurora borealis are 15 seconds, f/2.8, and 640 ISO. When including illuminated architecture in the composition, however, this exposure doesn’t work. The building will be grossly overexposed. Therefore, this kind of shot has to be done is two stages. First, you have to photograph the architecture with a correct night exposure, and a second picture has to be taken of the sky. Then, in Photoshop, they are combined. In this case, I used the new sky replacement feature in Photoshop (Edit > sky replacement) to make the composite. The software did an amazing job especially around the tops of the trees.
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