The B+W ND Vario filter can be precisely adjusted to the desired situation thanks to its continuously variable density. It features an index setting that allows the photographer to determine the required density between +1 and +5 stops. To avoid imaging errors, the light reduction cannot be set beyond a critical value. Color reproduction remains consistent across the entire adjustment range. With the B+W ND Vario filter, professional imaging performance is achieved even at high filter factors. The B+W ND Vario filter can be continuously adapted to a wide variety of subject situations. A large aperture is often desired to visually separate the main subject from the background, or to achieve deliberately long exposure times to depict flowing water in a soft, dreamy manner. The B+W ND Vario filter is ideal for DSLR video when a specific aperture setting is required.