The [Name] Filter is a solid ND filter that provides a [C-Densidad] exposure reduction. Its density creates a darkening of the entire image, allowing you to photograph with a wider aperture or slower shutter speed than normally required. By slowing your exposure time or increasing your aperture, you are able to control depth of field and convey movement more easily. Neutral density filters do not affect the coloration of the image and are ideal for pairing with other filters. This [Name] is made by optical resin CR39.
Have you seen those pictures with blur water effects, cloud trails or crowded places without people? Those pictures have been made using ND filters.