The Formatt HD Crown Schott-Desag B270 0.9 Optical Glass Neutral Density (ND) Filter has been specially formulated following extensive research into A.C.T. molecular dye applications. 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.

HD technology has been designed for today's filmmakers and videographers who use the latest ultra-precise cameras and lenses.

Formatt, a company with three generations of experience in professional filter manufacturing, produces each filter to the highest technical standards. The finest materials, combined with state-of-the-art production technology, have resulted in an unequalled level of optical excellence.


- Formatt HD neutral density filters, both solid and graduated, are available in all popular screw-on sizes and in all standard square formats
- All Formatt filters feature a unique edge frame offering maximum protection against chipping, surface scratches and allowing easy handling and cleaning
- 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 field
- Formatt HD neutral density filters have the same densities and stops as Kodak Wratten standards
- Formatt neutral density filters meet the needs of many directors of photography and filmmakers who find it important to shoot with the widest possible aperture to minimise depth of field, particularly with HD


Neutral density filters have four main uses

- Allow the use of slow shutter speeds, particularly with fast films, to record motion of subjects such as waterfalls, clouds or cars
- Decrease depth of field by allowing the use of wider apertures, which helps separate subjects from their background
- Decrease the effective ISO of fast films (above 400 ISO) and allow their use outdoors in bright situations
- Allow cinema and video cameras (which have fixed shutter speeds) to film subjects like snow, sand or other bright scenes that could cause overexposure


Neutral Density Factors

- ND.3 (exposure adjustment = 1 stop, reduces ISO by 1/2)
- ND.6 (exposure adjustment = 2 stops, reduces ISO by 1/4)
- ND.9 (exposure adjustment = 3 stops, reduces ISO by 1/8)
- ND1.2 (exposure adjustment = 4 stops, reduces ISO by 1/16)