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
Include Step Up Filter Adapter Ring Kit(37-49, 49-52, 52-55, 55-58, 58-62, 62-67,67-72, 72-77, 77-82mm)
Include Step Down Filter Adapter Ring Kit(49-37, 52-49, 58-55, 55-52, 62-58, 67-62,72-67, 77-72, 82-77mm )