The Formatt 5.65x5.65" Neutral Density (ND) 1.2 HD Schott-Desag B270 Crown optical glass filter has been specially formulated following extensive research into new applications for A.C.T. molecular dyes. The filters offer a more neutral grey without the specular effects of particulate coatings found in current neutral density and graduated neutral density filters, allowing the user more precise control.nnFormatt, a company with three generations of experience in professional filter manufacturing, produces each filter to the highest technical standards. The finest materials, combined with cutting-edge production technology, have resulted in a level of optical excellence unmatched elsewhere.nnn- Formatt's solid and graduated HD Neutral Density filters are available in all popular screw-on round sizes and all standard square sizesn- All Formatt filters are finished with a unique edge frame offering maximum protection against chipping, surface scratches and allowing easy handling and cleaningn- With the filter description on the top of the frame, filter identification is also much easier, particularly when filters are stored in cases in the fieldn- Formatt's HD Neutral Density filters have the same densities and light stops as Kodak Wratten standardsn- Formatt's Neutral Density filters are a response to the many directors of photography and filmmakers who find it important to shoot with as wide an aperture as possible to minimise depth of field, particularly with HD; In response to professional demand for an optically correct and flawless neutral density filter for HD, Formatt has designed its HD Neutral Density filters, which are the ultimate solution for enhancing colour contrast and are ideal for normal light reductionnnnNeutral density filters have four main usesnn- To enable the use of slow shutter speeds, particularly with high-speed films, to record the movement of subjects such as waterfalls, clouds or carsn- To decrease depth of field by allowing the use of wider apertures, which helps to separate subjects from their backgroundn- To decrease the effective ISO of high-speed films (above 400 ISO) and allow their use outdoors in bright situationsn- To allow cinema and video cameras (which have fixed shutter speeds) to film subjects such as snow, sand or other bright scenes that could cause overexposurennnnNeutral density factorsnn- ND.3 (exposure adjustment = 1 stop, reduces ISO by 1/2)n- ND.6 (exposure adjustment = 2 stops, reduces ISO by 1/4)n- ND.9 (exposure adjustment = 3 stops, reduces ISO by 1/8)n- ND1.2 (exposure adjustment = 4 stops, reduces ISO by 1/16)