The 0.3 Neutral Density Soft Grad filter reduces exposure by 1 stop without affecting colour balance. Due to the size of the front element of ultra-wideangle lenses, the filters for the SW150 system are larger than those in the standard 100mm range: these graduated filters are 150 x 170mm.
Lee graduated neutral density filters are useful when photographing a landscape in which the sky is much brighter than the foreground. Simply placing the Neutral Density part of the filter onto the sky in the frame will reduce the sky exposure without affecting the foreground. This enables cloud detail to be kept correctly exposed and avoids the “white out” effect caused by exposing for the foreground.