Common skin warts (also called cutaneous warts) are raised round or oval growths. A wart may be lighter or darker than the skin around it. Some warts may have tiny black dots in them, often called seeds. The dots are small, clotted blood vessels. Warts may occur alone or in larger groups that merge and form patches.
According to Canon (link):  Canon addressed the âfeedback loopâ in later model IS lenses by introducing an algorithm to the IS detection system to automatically recognise when the lens is mounted to a tripod.
The optional DSLR camera lens mounts give the entire line of Canonâs EF Lenses versatility, from a fisheye to telephoto and everywhere in between. With filters such as polarizing filters, the photographer is able to enhance picture quality by blocking undesirable reflected light.