Ni060 filters are used to restrict visible and/or near-IR light, reducing the amount reaching the camera sensor, thus allowing for longer exposure times and reduced depth of field. This technique can improve the separation of subject matter from the background. Ni060 transmission is approximately 25% while reflected light averages about 20% over the 400-1100nm wavelength range. These filters include identical male and female threads on either end so that they can be stacked with other ND filters to achieve various optical densities.