Lee Adaptor Rings screw onto your lens to accommodate the filter holder or lens shade. Once the ring is in place the holder clips into place using a smooth, quick release spring loaded mechanism. Wide-angle adaptor rings are designed so that the filter is placed as close as possible to the front element of the camera lens, & should be used when vignetting is encountered with a standard adaptor ring. Sturdily constructed with an aluminium screw thread, this is a wide angle adaptor ring for lenses with an 82mm filter thread.