Flash Firing Restrictions Due To Temperature Increase - Canon Speedlite 470EX-AI Instruction Manual

f Flash Firing Restrictions due to Temperature Increase
When continuous flash or modeling flash is repeatedly fired in short
intervals, the temperature of the flash head, batteries, and the area near
the battery compartment may increase.
When you perform firing repeatedly, the firing interval increases in
steps to avoid degrading or damaging the flash head due to
overheating. When you perform firing repeatedly even more in this
state, flash firing is restricted automatically.
Furthermore, when flash firing is restricted, a warning icon is
displayed to indicate the increase in temperature, and the firing
interval (with which the flash photography can be performed) will be
automatically set to approx. 8 sec. (level 1) or approx. 20 sec. (level 2).
Temperature Increase Warning
As the internal temperature of the Speedlite increases, the warning is
displayed in two levels. When you perform continuous firing repeatedly
even more in the state in level 1, the state changes to level 2.
Display
Icon
LCD panel illumination
Number of Continuous Flashes and Rest Time
The following table shows the number of continuous flashes until the
warning (level 1) is displayed, and the necessary rest time (guideline)
until normal flash photography can be performed.
Function
Continuous full
output flash (p.17)
Modeling flash
(p.38)
96
Level 1
(Firing interval: Approx. 8 sec.)
e
Red (lit)
Number of Continuous Flashes to Reach
Level 1 Warning (Guideline)
Flash Coverage
14mm 24mm
45 times or more
35 times or more
Level 2
(Firing interval: Approx. 20 sec.)
Red (blinking)
35mm
28mm
or more
40 times or more
f
Necessary
Interval
Time
(Guideline)
40 min.
or longer