Recently, I lead a Mentor Series Trek to Monterey, California for Popular Photography Magazine. Despite several days of rain, we managed to get some fun images. Before the trek, I bought a -10 stop B&W Neutral Density Filter so I could shoot some long exposures of the ocean in the daylight.
In the first image, my exposure was ISO 200 f/14 @125th of a second.
With the neutral density filter in place, my exposure went from 1/125th of a second to 15 seconds. With a super long exposure, objects that move such as water take on a surreal look.
I actually prefer converting long exposures into black and white for a more dramatic effect. Here is another long exposure at Garrapata Beach. The exposure was 20 seconds on this particular image.