The NanoPro Magnetic ND 1.8 filter provides a 6-stop reduction in light while darkening the entire image. The included adapter ring screws on to the front threads of your lens and allows the ND 1.8 filter to attach magnetically.Haida's NanoPro Magnetic filters can be stacked with other magnetic filters from Haida without vignetting.. | Haida | | 62mm NanoPro Magnetic ND 1.8 (64x) 6-Stop Filter with Adapter Ring | Best Buy