Good filter and good value
Works just great. Note that this filter rotates so that you can have it vertically or horizontally. This is done via the front knurled ring but you could easily turn this thinking you were screwing the filter into the thread on your lens. This could lead to the filter falling off. So the back ring is for tightening and the front ring is for rotating. I have no issues with this filter and would happily by more from this range. I am using it on an expensive camera with quality lens and see no degradation in image quality.