Wider outer optic to help reduce vignetting at wide angles,Made of high quality optical glass by K&F Concept technology
The K&F Concept Variable 40.5 mm ND filter can take the place of a range of graded ND filters which saves money and time
This Variable Density filter is an especially useful tool when creating motion blur in moving water such as waterfalls, rivers and crashing waves
Ultra slim frame, only 4mm thickness.Double side 18-layer coated,water repellent,anti-oil,anti-dust,anti-soil,scratch resistant.
Ultra slim rim profile to avoid vignetting on wide angle lenses, while maintaining rotation capabilities to adjust polarization levels. Extra tough Magnalium frame ensuring great durability and jamming prevention.