A ring USM (Ultrasonic Motor) provides silent AF and full-time manual focusing. As the lens length does not change during focusing, accessories such as Macro Ring Light at the front end of the lens, can be easily operated. Maximum magnification can be increased either 1.4 X or 2X by using Extender EF 1.4 X or EF 2X.
Avoid direct sunlight when unloading the film Keep your exposed cartridges in a cool dray and shady place and have them processed as soon as possible Do not leave the same roll of film in your camera for months on end, since black and white film may become fogged and color film may experience a definite color-shift