Fotga 49mm Slim Fader Variable ND Filter Adjustable Neutral

This Fotga ND filter is much thinner than that of other brands, two filters fits each other better.It is adjustable from ND2, ND4, ND8 to ND400 infinitely, satisfied different shooting conditions.Neutral Density (ND) filters can reduce the intensity of light equally without appreciably changing its color.Neutral density filters are often used to achieve motion blur effects with slowing shutter speeds.Mark scale and "Min"(the lightest), "Max" (darkest) tags on the outer ring to help users accurately resets to a certain density.In a strong light environment, to shoot the scene of small depth of field (blur the background, thus showing the main body).