5D with 24-70L at 25mm, f/2.8, ISO 160. Combined in photoshop with linear dodge (Add).
First attempt at star trails. Compiled in photoshop from multiple exposures, each 1 min. duration. Using shorter exposures rather than one long exposure reduces noise and lets you select which images you want. Also, if your battery dies in the middle of a long exposure, you lose the image. My remote trigger took images for about 47 minutes and I only used about 20 minutes as the beginning and end had clouds blowing by.
Google "Dan Heller" for some really cool star trails.
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