By technical editor Matt Allard: Using cameras that don’t have built-in ND filters can be problematic, to say the least. Variable ND filters are often the solution but they come in varying levels of quality and price. Swapping a Variable ND from lens to lens means using a step-down ring and constantly changing over filters. … Continue reading Revar Cine Rota-Tray 4×5.65/138mm Variable ND Kit – a matte box based solution to neutral density