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.
Some DSLRs, like the Canon EOS 6D, feature sensors that are equal in size to 35mm film. These full frame cameras are generally more expensive than their APS-C counterparts. If you see yourself moving up to a full frame in the future, be careful in buying lenses.