Kenkos uniquely designed variable neutral density filter provides the equivalent brightness range of ND 2.5 to ND 1,000. (practical use being up to ND450).The singular versatility of the Variable NDX filter not only replaces a whole set of stacking neutral density filters it also removes vignetting which may be caused by using multiple filters.DMC - Digital Multi-CoatedDigital multi-coated filters greatly reduce the appearance of lens flare and ghosting caused by reflections.For Longer ExposuresWithout changing the aperture, the Variable NDX filter allows the freedom to change the shutter speed according to the effect desired. For example, without adjusting the aperture, the same 1/60 scene can be taken using the Variable NDX filter with shutter speeds from 1/20 to 6 seconds, with just a turn of the outer filter ring.The problem of diffraction is eliminated by being able to work with a slow shutter speed.For Wider AperturesWith the Variable NDX filter, the shutter speed remains constant for a wide aperture, easily creating a blurred background effect.Prevents Overexposure / Highlight ClippingEven with a shutter speed of 1/8000 seconds, a large aperture of F1.4 or F1.2 can cause overexposure / highlight clipping. With the Variable NDX filter, this overexposure is eliminated.For HDSLR MOVIESFor HD video-enabled cameras, use the Variable NDX filter to easily adjust light control and shutter speed. The Variable NDX filter makes it simple to produce blurred background effects, simulate a night scene or create manual fade in / fade out effects. It is also perfect for use in bright locations such as beach or snow scenes and cityscapes.Easy to Operate / Easy Framing / Easy FocusWith a tripod mounted camera, use the brightest setting for framing and focus and then increase the density to your desired level by simply turning the outer filter ring.1. Framing and Focus2. Turn the outer Ring3. Adjust the Aperture and Shutter Speed4. Shoot