LEE Filters Bug 0.9 ND Hard Grad Filter for GoPro
The LEE Bug 0.9 ND Hard Grad Filter is designed for use with the Bug 3 or Bug 3+ Filter Holder for GoPro cameras. This graduated filter features one clear half and other half coated in a 0.9 (3-stop) neutral density layer, with a soft edge separating the two. It is ideal for lowering the exposure on specific areas, such as bright skies, without affected the exposure of other areas of the image. Note that in shots with camera movement, the separation between the two halves may become visible.
Note: LEE Filters recommends setting your GoPro's metering mode to "spot metering" for best results with this filter.