Improve your photography with the HOYA ND 8X PROND 49mm ND filter. The main reason why you should want one is that it partially blocks light coming into the lens, allowing you to work with longer shutter speeds. It also captures objects in motion and adds a blurred effect. Another interesting effect of all ND filters is that you can use a wider aperture for a striking depth of field effect. The HOYA ND 8X PROND 49mm ND Filter has a 49 mm filter diameter, making it compatible with all lenses of the same diameter. The Slim variant means that the filter frame doesn't create the vignette effect. The ND factor of 8 indicates a light transmittance of 13%, i.e. a 8x longer exposure time.