This 2 stop diffuser is ideal for diffusing harsh sunlight in mid afternoon. This means you will be diffusing the light by two stops and can be measured by use of a light meter. Collapsible Illuminator Reflectors, Silks & Solids are compact, lightweight and convenient to carry. When open, they are flat squares or rectangles. No dis-assembly is required to close them. They effortlessly fold to small, hand-held circles one-third their original size. High-carbon steel frames are riveted, to stand up to use.