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.
Tripods are necessary to steady the camera for long exposures and for positioning the camera during certain types of evidence photography. Medium speed (ISO 100 or 200) color print film is most often used for crime scene photography. Blackâandâwhite film is used for certain types of evidence photography.