These lens caps are great for digital cameras. Just point at a subject area and the light is diffused to create an average white balance for a particular scene. (Check camera manufacturer's manual for setting white balance.) Slips on to the front of any lens, or a lens with a protective filter. If your lens has bayonet threads on the outside, simply use the adapter provided. Handy loop to connect to a camera strap or strap lug so you dont lose the cap. Sizes available 58mm through 77mm.