My wife gave me my Christmas wish, an X Star Premium. Included in the bundle of gifts were a set of Neewer ND filters 4,8 and 16. I removed the X Star lens cover and tried to screw on the Neewer #8 ND filter. I tried to tighten the lens up to no avail. When I finally thought the filter was on, I wiggled the filter and it slipped right off. It seemed it was not gripping the threads on the camera lens. Almost as if the filter was too big large for the camera. Has anyone had any dealings with the Neewer ND filters from Neewer. There web page is Neewer.com. The product details says they will fit an X Star and a X Star Premium. If I am doing anything wrong please let me know.