The bottom half of this filter has no ND coating and the top half has a 3 f-stop darkening that starts in the middle of the filter and fades towards the top. This allows you to balance your exposure when there is flat light on the horizon – like at sunrise and sunset – and capture more detail within the lowlights and highlights. Our Plus+ range features 20 layers of nano-coating providing a more consistent transmission curve for truer light reduction, easier cleaning, and better protection against water, oil, and scratches.