LEE Filters 58mm Oceanscape Pro Kit includes Foundation Kit, 58mm Wide Angle Adapter Ring, Big Stopper, Little Stopper, and Hard Edge Set
The LEE 4x4 Big Stopper is a 10-Stop ND Filter that will produce breathtaking images. With the Big Stopper, just a single filter allows you, the photographer, to increase the exposure to many minutes, rendering clouds soft, water smooth and milky, car headlights as streaks of color, or people as abstract, blurred figures.
The LEE 4x4 Little Stopper is a 6-Stop ND Filter and is ideal for those low-light conditions at the beginning and end of the day allowing you to enjoy increased flexibility with exposure lengths. In many shooting conditions, this means that detail and texture in areas of movement such as the sky and water would be retained, while still conveying a sense of time passing.
As a general rule, a hard grad would be used for images containing a horizon, or any hard transition between the sky and the foreground - even with jagged or mountainous horizons, the exposure can be controlled far easier with a hard grad. LEE filters Neutral Density Grads can be stacked together, or with other filters, so you can respond to almost any lighting situation.