The filter is very good for plastic. Scratches are unfortunately possible, but you have to watch anyway on his camera equipment. Contrary to the review of a colleague of Cokin ND8 is a real ND0,9 filters in reality. These are 3 stops, and no 13 This is due to the not really existing standardization of ND filters and the different naming. At least Cokin writes all data on the packaging, so mistakes are actually excluded. Written on the back of the package (3F Stops = 3 stops). That is, the exposure time is doubled 3 times. In one, with the camera, set exposure time of one second, it is possible with this filter, an exposure time of 8 seconds. (1x2 = 2 seconds 2x2 = 4 seconds 4x2 = 8 seconds)
