100mm x 100mm square neutral density filter in 4 models ranging from 3 stops to 10 stops. Works perfectly with the SIRUI Filter Holder (model SUNDH01) Darken the entire image with up to a 1,000x filter factor (3-10 stop exposure reduction). Photograph with a slower shutter speed or wider aperture than normally required and convey movement more easily. Will not affect the color of the image and can be paired with other filters. Extremely thin and measures only 2.0mm. German manufactured Schott plate glass B270. Exclusive multi-layer anti-reflective coating for perfectly linear, uniform light reduction from edge-to-edge, high light transmission capability and precise color rendition. Additional layers of protective coatings are applied providing a waterproof, oil-resistant, scratch-resistant and anti-static surface for easy cleaning. Available in 3, 4, 6 and 10 stop densities.