The Polaroid White Balance Lens Cap is great for use with digital cameras. Just place the White Balance Lens Cap, point your camera at a subject area, and the incoming light is diffused to create an average white balance for a particular scene. (Check camera manufacturer's manual for setting white balance.). The White Balance Lens Cap easily slips on to the front of any appropriately sized lens, or a lens with a protective filter. Even if your lens has a bayonet mount on the outside, simply use the adapter provided. The lens cap comes with a handy loop to connect it to a camera strap or strap lug so you don't lose the cap.