sigma ef-610 dg st electronic flash for canon digital slr cameras
the ef-610 dg st features a powerful guide number of 200ft 61m and is designed to work with the latest ttl auto exposure systems of all popular digital and film slr cameras . it features ttl automatic flash exposure control for easy operation . the autozoom function automatically sets the optimum illumination angle in accordance with the lens focal length in a range from 24mm to 105mm . when the built-in wide panel is used the flash can cover the angle of 17mm . for bounce flash the flashgun head can be tilted up by 90 degrees to the left by 180 degrees or to the right by 90 degrees . it can also be tilted down by 7 degrees allowing ease of use for close-up photography . in addition to automatic mode the flashgun also features a manual flash mode making it possible to set the flash power to full or 1 16 . when the flashgun is fully charged a confirmation ready light will be emitted and the flash exposure level can be checked through the camera s viewfinder . other features incorporated into this flashgun include the auto power-off function to help save battery power .