Canon 540EZ - Speedlite - Hot-shoe clip-on Flash Manual - Página 8
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6. Recycle Time
Short recycle times are invaluable in fast-changing situations where quick
shooting is necessary. For this purpose, the 540EZ provides a quick firing
mode in addition to its normal, full-power firing mode. In quick firing
mode, the flash can be fired before it is fully charged to provide fast recy¬
cle times. You can tell whether the flash is operating in normal firing
mode or quick firing mode by the color of the ready lamp, as described
below.
• For details on recycle times and guide numbers in normal and quick firing modes,
refer to page n in the Specifications section.
• Normal firing
Normal, full-charge firing is possible when the ready lamp lights red.
® Quick firing
When the A-TTL mode is set and the camera is set to single-frame
shooting, the pilot lamp turns green and quick firing is enabled.
What is a guide number?
The guide number of a flash unit is a numerical indicator of its light output capaci¬
ty. The appropriate shooting distance or lens aperture required for proper flash
exposure can be calculated from the guide number using the following formulas:
Guide number -f shooting distance (m) = proper aperture value
Max. shooting distance = guide number -f largest lens aperture
• The film speed is usually assumed to be ISO 100 when stating guide numbers.
At different film speeds, the guide number increases or decreases accordingly.
II. Changing the Flash Settings
1. Flash Coverage Angle (Zoo
and Use of the Wide Panel
The 540EZ incorporates an auto zoom function which automatically sets
the flash coverage angle to match the focal length of the lens mounted on
the camera. Coverage angles are available for focal lengths ranging from
24mm to 105mm, and the coverage angle automatically changes when the
lens is zoomed. The flash coverage angle can be set either automatically or
manually. Moreover, a built-in wide panel provides coverage for super-
wide-angle focal lengths as short as 18mm.
• When the flash coverage angle is changed, the guide number also changes. The
relationship between the flash coverage angle and the guide number is shown on
page n in the Specifications section.
• The lens focal length corresponding to the currently set flash coverage angle is
displayed in the LCD panel.
• Auto Zoom Operation
The flash coverage angle is automatically set according to the focal
length of the lens mounted on the camera, and the setting is displayed in
the LCD panel. Also, when a zoom lens is used, the flash coverage angle
automatically changes when the lens is zoomed, and the new setting is
displayed in the LCD panel.
1
Turn on the power to the cam¬
era.
O Turn on the power to the
540EZ.
• If El Zoom is displayed in the
LCD panel, press the zoom but¬
ton until only "ZOOM" is dis¬
played.