http://www.usa.canon.com/cusa/support/professional/professional_cameras/flashes/speedlite_540ez?pageKeyCode=writeReviewPage
Speedlite 540EZ
8158

Specifications
Main Unit Spec
| Flash | |
| Type | Direct-coupling clip-on type A-TTL/TTL automatic flash with AF auxiliary light (compatible with 5 focusing points when used with EOS 1N), A-TTL pre-flash, auto zoom, and bounce functions. |
| Compatible Cameras | All Canon EOS cameras. |
| Flash Coverage | Auto Zoom: Zoom position is automatically set according to focal length data received for the lens when the shutter button is pressed halfway (SW-1 ON). Manual Zoom: Zoom position changes sequentially according to manual operation of a push button located on the flash unit. Wide-angle diffusion panel: When the wide panel is manually pulled into place, the flash automatically zooms to the 28mm position to provide a coverage and angle equivalent to an 18mm lens. Zoom Stop Positions: Seven Positions: 24mm, 28mm, 35mm, 50mm, 70mm, 80mm, and 105mm (During bounce flash photography when the flash unit is set for auto zoom, the zoom position is automatically set to 50mm). |
| Color Temperature | Equivalent to daylight. |
| Sync Speed | Zoom Speed: Approx. 0.8 sec (at normal temperature). |
| General | |
| Dimensions | 3-1/8 x 5-7/16 x 4-7/16 in., 80 x 138 x 112 mm. |
| Weight | 14oz./405g (without batteries.) |
