DESC: The Speedlite 430EX improves on many specifications of its predecessor and includes additional features to maximize digital image quality when using a flash. These include automatic selection of camera white-balance settings and auto-adjustment of the zoom flash position to match the sensor size of the camera to which the unit is attached. The Speedlite 430EX has increased its guide number to 43 (m/ISO 100 at 105mm) and has approximately 40% faster recycling time than the Speedlite 420EX.