I used my B+W ND110 10 stop Neutral Density filter, circular polarizer, and hand held two more gradual neutral density filters during the exposure to even the sky and foreground.
No 1s, 2s, or 3s!
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You have an entire book's worth of 30 second exposures. And in fact, that's exactly what you should call it - "30 seconds". Make the darn thing, will ya?