The Marumi ND4 Grey Filter reduces the light volume without altering whole colour tones, allowing you to delay your aperture by two stops. The filter allows you to lengthen your shutter speed without adjusting your aperture to create a fluidity effect. The ND4 grey filter is suitable for use outdoors, along the seaside or in the mountains covered in snow. Due to its thin design, the Marumi grey filter can be used in conjunction with wide-angle lenses without causing vignetting to the image.