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 exposure of the subject is determined by the metering sensor. Canon has developed a new 63-zone Dual-layer Metering Sensor with a dual-layer photo sensor. The first layer measures blue-green light and the second layer measures green-red light.