The Lee SW150 ProGlass IRND 4 Stops is a new, high-quality glass filter with neutral density. The filter is developed for the movie industry to meet de demanding needs of leading cinematographers. ProGlass filters are filters of the highest quality with neutral density. The reason for this is that ProGlass filters are really neutral. As a consequence colour casts belong to the past. Because the filters block both ultraviolet as well as infrared, the images are clear and crisp, and moreover precise.
ProGlass filters are made of 2mm thick glass and are available in 0.6 ND (2 stops), 0.9 ND (3 stops), 1.2 ND (4 stops), 1.8 ND (6 stops), 3.0 ND (10 stops) and 4.5 ND (15 stops), meeting the needs of every photographer, from subtle changes to very long exposures. ProGlass IRND filters are available for the Seven5, 100mm, and SW150 filter systems. This filter is a 1.2 ND (4 stops) filter for the SW150 system.