This Lee Filters SW150 ProGlass IRND Premium 3 filter collection includes the 150mm ProGlass IRND 6-stop 1.8, 150mm ProGlass IRND 10-stop 3.0 and the 150mm ProGlass IRND 15-stop 4.5 filters. These filters are remarkably neutral, with virtually no color shift and extremely accurate stop values. And because they block both infrared and ultraviolet pollution, blacks remain pure and clean, while colors are crisp, punchy and vibrant. The Lee Filters ProGlass filters are constructed from scratch-resistant optical glass for clarity as well as color fidelity and feature a built-in gasket to help form a seal that is intended to prevent stray light, which could have unwanted effects on exposure, from coming in between the filter and the lens behind it.
For efficient use in the field, two exposures guide are included that show the amount of exposure reduction the 150 x 150mm ProGlass IRND Filters provide corresponding to a range of shutter speed settings from 1/1,000th of a second to 2 seconds before the filter is applied.