While this type of shot isn't anything new, I thought that since I was renting a 5D mark 3 I should try out some high ISO stuff. This shot was 3 exposures: f/8 for 10s at ISO 200, f/8 for 30s at ISO 200, then f/4 for 30s at a whopping ISO 25600 for the sky. The first two exposures were made during twilight; the sky exposure was made around 10 PM. The sky exposure turned out fairly well. With noise-reduction in Adobe Raw it cleans up pretty good.
Comments and critiques greatly appreciated. Thanks for looking!