The Heliopan 58mm Close-Up Lens +1 is used to extend the cameras focusing range into the close-up or macro range. The convex closeup lens shortens the effective focal length of the camera lens. Close-up lenses can be combined to obtain greater magnification. No exposure correction is required. Closeup lenses do not require additional light or larger apertures that are necessary when using extension tubes . For best results stop down to f 5.6 or f8.