Fader ND Suit for ultra wide angle lens.free to rotate ... use 2 stop larger front glass. e.g. a 67mm Fader ND, equips with a 67mm back thread (attach to camera ... lens), and a 77mm front glass/ filter thread.3.Fader ND is available at49mm.52mm, 55mm, 58mm, 62mm, 67mm, 72mm ... , 86mm.4.apply slow shutter speed under strong sunlight exposure. TIANYA Fader ND(Adjust for ND2 TO ND400)