K&F Concept Unlimited Variable ND2-ND400 Neutral Density Filter For Camera Lens 37mm-82mm Multilayered Nanometer Coatings K&F Concept ND2-ND400 (1-9 Stops) Variable Adjustable Neutral Density Filter 37mm 40.5mm 43mm 46mm 49mm 52mm 55mm 58mm 62mm 67mm 72mm 77mm 82mm With Cleaning Cloth pls choose what you need size. please verify your camera`s lens thread size before ordering. Slim Adjustable ND Filter Feature: Reduces the amount of light reaching the film without affecting the color. Applies slow shutter speed under strong sunlight exposure. Glass mounted with high pressure press technology. Made of high quality optical glass by K&F Concept technology. Wider outer optic to help reduce vignetting at wide angles. Extinction paint seiko manufacturing,To achieve the testing sights on military standard. ND Filter Function: Neutral density can be adjusted from ND2 to ND400, Reduces the amount of light reaching the film without affecting the color. Have Control of Any Lighting Environment. Allows wider apertures, effectively decreasing depth of field. Suitable for dynamic screen,waterfalls, streams,waves, etc. NOTE: 1.Please verify your cameras's lens thread size before ordering.This number is always preceded by a ""(diameter)symbol. 2.When using the ND filter to the maximum(ND400) or bigger degree density, it will appear "X" spot or a blur in the picture,this is a normal phenomenon. (Suggestion:lower down the density value gradually and reduce the aperture, until the facula disappeared)