Canon speedlite 420ez
Designed exclusively for Canon EOS cameras, it was also once used to be Canon top flash model for the EOS cameras. This dedicated automatic flash features an auto internal zoom mechanism that matches the flash coverage of the lens in use from 24mm to 80mm. The 420EZ has automatic A-TTL operation - the EOS camera measures the ambient light to determine flash-to-subject distance and set the aperture. The 420EZ also features a Rapid Fire Flash System.
Guide number; Guide Number of 116 (ISO 100, feet a 50mm coverage angle)
Modes; A-TTL or manual from 1/1 to 1/32 power
Sync speed; 1/250 sec.
Head type; Swivel, bounce and zoom.
First or second curtain flash sync.
Power source; 4x AA batteries.