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I vary from 400 to 1600 on my D800e. Just depends on what I'm trying to capture and my limitation of working from static tripod limits my exposure time so to gain signal I up the iso for grabbing a bit more knowing i need to capture more subs and have more noise to contend with at the end. If my target is bright I lower iso to 400 for better snr.I know my vis mag limit is about 13.5 so usually its the vis mag of my target that dictates my iso and collection efforts.
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