Rosco 20x24 An intense red-blue. Deeper than 83 with a little more red. (Transmission = 2%). Experience the Rosco Roscolux #384 Midnight Blue Gel Filter, a professional-grade color correcting filter designed to enhance your photography or videography. Measuring 20 inches by 24 inches, this filter is crafted from durable polyester and features a multi-coating for optimal performance. It offers an intense red-blue effect, deeper than #83 with a touch more red, transmitting only 2% of light. Ideal for creating dramatic, stylish images with a dark, blue hue. Not water-resistant.