Urth 72mm ND64-1000 (6-10 Stop) Variable ND Lens Filter Plus+ provides 6 to 10 f-stops of light reduction, giving you greater creative control in bright-changing light. By blocking 6 to 10 f-stops, you can use wider apertures in bright variable light for shallower depth of field effects, and slower shutter speeds for long exposure effects without overexposing your images. Urth 72mm ND64-1000 (6-10 Stop) Variable ND Lens Filter Plus+ range features 20 layers of nano-coating providing easier cleaning and better protection against water, oil, and scratches. These layers also provide a higher maximum light transmission and a more consistent transmission curve for truer light reduction. If used with very wide lenses, the X-effect may occur above f/9. Professional German GlassIndustry-leading German B270 SCHOTT optical glass is coated with a 20-layer nano-coating for truer light transmittance, better protection, and easier cleaning.Ultra-Slim RimOur consciously designed ultra-slim rim avoids vignetting and our durable magnalium is guaranteed for life.Double-ThreadedAll our filters are double-threaded for stacking filters or using screw-mount lens caps.