The 75 x 100mm Haida Red-Diamond ND Filter is a 3-stop glass filter designed for the Haida M7 Filter Holder. its 0.9 density creates a darkening of the entire image, allowing you to photograph with a wider aperture or slower shutter speed without overexposing your image. By slowing your exposure time, you can create motion blur for special effects or to convey a sense of movement. Opening your iris allows you to create shallow depth of field, which can help isolate your subject.