Neutral density filters have been around forever, and depending on the manufacturer, are available in full-stop, half-stop, third-stop and even tenth-stop increments.  Depending on your needs, ND filters can be stacked together to create any number of density levels, based on how wide you want to keep your lens aperture or how slow you want to drag out your shutter speeds, without affecting the color ... Read More

The Cokin Creative Filter System consists of a rectangular plastic filter holder with four slots (one for Cokin rotating filters and three for rectangular ones), a variety of optional adapter rings which click into place and rotate, and many optical resin filters. ... Read More