Brand: Ambico Product Category: Lens Filter (Graduated Type) Color/Number: 7773 Light Gray Brand: Ambico Product Category: Lens Filter (Graduated Type) Color/Number: 7783 Light Gray Product Name: Ambico Lens Filter, 7783 Light Gray Graduate (or Gradient ND). The outer packaging has stains, but the contents are clean. Usage: This is a camera lens filter that provides a graduated effect (light reduction effect) from dark to light areas of an image.