The NiSi 67mm Swift True Color VND Kit allows you to simply press additional filters onto the front of your VND, giving you the ability to reduce exposure by 1 to 9 stops. The True Color VND offers great control over exposure settings, allowing you to reduce shutter speeds and use wider apertures for those stunning shots. Plus, with its true color result that avoids color shift, you will be able to take pictures in any condition, bright and sunny or dark and dreary. Optimal Picture Clarity The Swift System also comes with an exposure range-control filter ring with hard stops at each end, so you can easily dial in your desired effect. With its high-definition optical glass, nano-coating, True Color result that avoids color shift seen in other Variable filters and no 'X' effect, this ND filter is sure to give you the results you desire. The NiSi Swift True Color VND Kit 1 to 9 stops (1-5 Stops VND + 4 Stop ND) includes a NiSi True Color 1-5 Stop VND and an ND16 (4 Stop) ND that can be combined to cover a range of 1 to 9 stops, making this one of the most versatile variable ND kits on the market.