The 77mm Genustech Eclipse ND Fader Filter is a solid variable neutral density filter providing an exposure reduction of approximately 2 to 8 stops. The 0.6 to 2.4 optical density creates a darkening of the entire image, allowing you to photograph with a wider aperture or slower shutter speed than normally required. The degree of density is easily controlled by rotating the front filter ring, helping you to predetermine the additional exposure length required. By slowing your exposure time or increasing your aperture, you are able to control depth of field and convey movement more easily.
The filter is constructed from optical glass for high image quality and features an aluminum filter ring for rigidity and to prevent filter jamming. For easier, repeatable control over density settings, the front ring is visually demarcated with dots that represent different density values. The front 82mm female threads of the filter are larger than the rear 77mm male threads to help minimize vignetting.