The 77mm Variable NDX Neutral Density Filter from Kenko permits you to create some exciting special effects such as capturing the movement of a serene rippling brook or the chaos of swirling city traffic.
With this one single filter, you can eliminate the need to carry several ND filters with you in order to get the shot you need. Merely by rotating its outer ring, you dial in the degree of neutral density you want. Take your shot, check it on the LCD of your camera and if it isn't what you want, simply dial in a different density and re-shoot.
Another advantage of this filter is not having to suffer the expense of buying numerous ND filters, carrying them around and having to stop, change filters and hope you get the shot. With its capability of capturing ND factors of 2.5 to ND1000, you'll be able to take multiple shots of the same subject without changing your aperture. For example, a shot normally taken at 1/60 sec can be captured from 1/20 to 16 seconds without changing your aperture. For the landscape shooter, this filter is a blessing since it permits you to effortlessly create numerous looks of the same shot.
For the HD video shooter, you'll find this filter will be of immeasurable use when it comes to light control and for creating fade-in/fade out shots. Most of all, and irrespective of whether you shoot stills or video, you'll never have to worry about vignetting (the darkening of the corners of your image). Traditionally, ND filters had to be stacked to create exaggerated effects where often that lead to vignetting since the edge of the filters themselves tended to intrude into the image. This filter will make your outdoor shooting easier, more comfortable, successful and will also open up new worlds of special effects.