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 D40 from Nikon is another camera that performed well in low light conditions, thanks to their noise reduction routine for high ISO levels. We really noticed it when we reached an ISO level of 1600. With most cameras, you start to see noise with long exposures, and a decrease in color saturation.