The B+W ND-Vario filter can be adjusted exactly to the desired situation thanks to its infinitely variable density. It has an index setting that allows the photographer to determine the required density between +1 and +5 f-stops. In order to avoid imaging errors, the light reduction cannot be set above a critical value. The colour rendition remains constant over the entire setting range. With the B+W ND-Vario filter, professional imaging performance is achieved even with high filter factors. The effect of the B+W ND-Vario filter can be infinitely adjusted to a wide variety of motif situations. Often a large aperture is desired to optically separate the main subject from the background or deliberately long exposure times to softly depict flowing water. The B+W ND vario filter is ideal for DSLR video when a certain aperture is to be achieved.-B+W Premium Line: XS-PRO Digital-B+W coating: MRC nano.