Canon Speedlite 540EZ Manual page 29

Specifications
Type
Clip-on type automatic flash unit with direct-cou¬
pled contacts (including AF auxiliary light corre¬
sponding to 5 focusing points, A-TTL pre-flash,
auto zoom and bounce functions)
Guide Number (ISO 100 • m)
(See page 30)
Battery Life and Recycle
Times
(See page 30)
Flash Duration
1.2 ms or less during normal firing; 2.3 ms or
less during quick firing.
Coverage Angle
(1) Auto zoom mode: Automatically set accord¬
ing to focal length of the lens in use (set¬
tings: 24, 28, 35, 50, 70, 80, 105)
(2) Manual zoom mode: Manually set by press¬
ing the zoom button.
(3) Wide panel: Flash coverage for super-wide-
angle lenses down to 18 mm is possible by
covering the flash head with the built-in wide
panel.
Flash Modes (1) Normal firing;
(2) Quick firing;
(3) Stroboscopic flash: stroboscopic frequency
and no. of bursts each settable in 31 steps;
(4) Pre-flash: for measuring A-TTL distance
information;
(5) Test firing: by pressing the test firing button.
Flash Head Positions
Direction
Maximum
rotation
angle
Click stops
Up 90°
0°, 60°, 75°, 90°
Left
180° 0°, 60°, 75°, 90°, 120°, 150°, 180°
Right 90° 0°, 60°, 75°, 90°
Down 7° 0°, 7°
Exposure Control Modes
A-TTL program automatic flash, TTL program
automatic flash, Manual
Flash Metering System
TTL automatic flash metering of light reflected off
the film plane.
Flash Exposure
Compensation
(1) Automatic flash output reduction control pro¬
vided in daylight fill-in flash situations;
(2) Manual compensation can be set on the
flash within a range of ±3 stops in 1/3-stop
increments. (Possible in all shooting modes
except fully-automatic shooting modes.)
(3) With some EOS models, flash exposure
compensation is possible from the camera
side by turning the main dial.
Flash Coupling Range
(50mm f/1.4, ISO 100)
A-TTL normal firing: 0.5~30m / 1.7 ~ 99ft, Quick
firing: 0.5-7.5m / 1.7 - 25ft (min.) to 0.5-21 m /
1.7 - 69.3ft (max.).
X-sync Shutter Speed (See page 31)
Flash Charge Completion
Indicators
When the ready lamp lights red, normal firing is
possible; When the ready lamp lights green,
quick firing is possible.
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