The Lee Big Stopper 100 X 100mm 10 stop Square Filter Glass is a high-quality filter designed for long exposure photography. It features a neutral density effect and a drop-in mount fitting for easy attachment to lenses. With its square shape and 100mm size, this filter is perfect for capturing stunning images with a wide range of f-stops, allowing for greater creative control over your photos. The Lee brand ensures top-notch quality and performance for photographers looking to enhance their work with advanced filtration technology.