A 206 second exposure in the predawn light of a rock formation just of the beach, at Singer Island, Florida.
A bit about the exposure. When I take these exposures the timing is always a bit tricky as the light is constantly changing with the coming dawn. My point is taking a light meter reading then mentally calculating for the exposure time, to compensate for the ND filters will result in an exposure about 20 percent too long. This exposure used stacked 10-stop and 6-stop filters with ISO 100.