The Tiffen 4 x 4" 85B/0.3 ND combination filter combines an amber 85B colour conversion filter and a 0.3 neutral density filter. The ND filtration provides an exposure reduction of 1 stop to darken the entire image, allowing you to photograph with a wider aperture or slower shutter speed than normally required. The 85B filtration covers the entire filter plane and converts the colour temperature to 3200K for use with Type B (tungsten) films.nnThis filter is made using ColorCore technology, a process that laminates the filter substrate between 2 pieces of optical glass, and grinds it flat to a tolerance of 1/10,000th of an inch. This filter measures 4 x 4" / 101.6 x 101.6 mm.nnFeatures:nn- Combination of an amber 85B colour conversion filter and a neutral density filter.n- The 0.3 ND filter darkens the image, allowing you to photograph with a slower shutter speed or wider aperture than normally required.n- The 85B filter converts the colour temperature to 3200K, allowing you to use Type B tungsten-balanced film in daylight situations.nnSpecifications:nn- Type: Combined colour conversion and neutral densityn- Size: 4 x 4" / 101.6 x 101.6 mmn- Grade: 85Bn- Filter Factor: 0.3 (1 stop)n- Effect: ND filter allows longer exposure. 85B filter converts light to 3200Kn- Application: For use with tungsten-based films in daylight situationsn- Colour Temperature: 5500 to 3200Kn- Construction: ColorCore Technology