The Lee SW150-9NDG-S 150 x 170mm 0.9 Graduated Neutral Density Filter is for the SW150 Filter Holder. For the landscape/outdoor shooter, the 2-stop Graduated Neutral Density Filter that comes with the basic SW150 system will more than get you in the game. The 2-stop filtration will allow you to blur that rippling water or make that high-flying bird seem to streak through air at super speed.However, there may be times when you want or need to tweak your shot to a more precise degree. That extra half stop can make the difference between a good shot and a shot that "sings". The extra width of this filter allows for movement within the holder to adjust for the horizon line.Determining which neutral density filter yields ideal results for any given lighting situation takes knowledge, experience and a collection of such filters.
- To allow cine and video cameras (which have fixed shutter speeds) to film subjects such as snow, sand or other bright scenes which could cause overexposure"
- To decrease depth of field by allowing wider apertures to be used, which helps separate subjects from their background
- To decrease the effective ISO of high speed film (above ISO 400) and allow it to be used outdoors in bright situation
- To enable slow shutter speeds to be used, especially with high speed films, to record movement in subjects such as waterfalls, clouds, or cars