Fotga 40.5 mm Ultra Slim Multi-Coating MC Fader Variable ND Neutral Density Lens Filter ND2 to ND400,Optical Glass, Aluminum Matt Frame, with Hard Stops

One single lens filter works from ND2, ND4, ND8, ND16, ND32 to ND400, releasing you from a bunch of filters for shooting Reduce the intensity of light without appreciably changing its colour, it allows to slower shutter speed under strong sunlight exposure in order to achieve motion blur (waterfalls, ocean, clouds), it also allows wider apertures for EFfectively decreasing depth of field Adjustable self-locking (with hard stops) design to facilitate positioning, when you rotate the exterior frame till "Min" tag (ND2) or "Max" tag (ND400), it can be automatically locked Ultra Slim profile design, the whole filter thickness is only 6 mm (much slim than similar products in the market), which can minimize vignetting when shooting at wider angles, the index marks on the filter let you know exactly the stops of ND at a glance Back thread (attaching to lens) is 40.5 mm, front thread (attaching to lens cap) is 43 mm