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 Wimberley WH-200 Gimbal Tripod Head II with Quick Release Base is a gimbal-type tripod head that incorporates an elevated tilt mechanism and adjustable platform to make the camera/lens' center of gravity and tilt axis of the head be perfectly aligned.