Fader Variable ND Filter Adjustable ND2 to ND400 Neutral Density for... Align the filter with the lens connector, screw it clockwise to the front of the lens, and tighten it. ND filters have different f-stop reduction numbers and transmittance thus generated can be applied for different shooting conditions, such as portraiture, water falls Simply rotate the ring of this filter, it offers 2 to 8 stops added density Conversely, the counterclockwise screw is loosened and the filter can be screwed out., ) K&F Concept 72 ND2-400 Filters Variable Neutral Density Adjustable ND Compatible for Canon RF 50mm f/1., 8 STM Lens with Canon EOS R6, R6 Mark II camera. Neutral Density (ND) filters can reduce the intensity of light without appreciably changing its color FOTGA 58mm Slim ND Fader Variable Filter Neutral Density ND2 to ND400... Carry ONLY a single filter with the same capability with ND2, ND4, ND8 and ND400 Canon RF 50mm Filter 58mm Variable ND Filter ND2 - ND400 Neutral Density For Canon Nikon Sony Olympus Canon RF 50mm F/1.8 STM Lens Filter