Haida NanoPro MC ND16 / ND 1.2 Grad Reverse Filter (75x100)

In contrast to the regular Neutral Density Grads where the graduation transition is from the top of the filter, the Reverse Grad offers the transition from dark to light from the middle of the filter (ie in reverse).
This is a benefit when shooting bright horizons to enable more control over the exposure and balance the foreground image.