The Nissin Di466 Flash for Canon digital cameras features cutting-edge photographic technology for Auto Focus and E-TTL / E-TTL II auto exposure systems, with precision and stability. The TTL flash power level is pre-set for reasonable exposures at the factory, however, users can reset the power to customize the flash to meet individual needs. This flash is easy to use and is packed with features such as variable power settings, an Auto Focus assist beam, and a power zoom that can tilt for easy bounce flash. It comes with a battery magazine system for quick power changes. The magazine has slots for all four batteries in the same direction for loading quickly, even in poor lighting. Additional magazines are available (not included).