Canon 550 EX - Manual (Page 48)

Stroboscopic Flash
Use the following formula to calculate
the required shutter speed.
Flash count ÷ Firing frequency
= Shutter speed
Example: If the flash count is 10 and
the firing frequency is 5 Hz, the
shutter speed will have to be at
least 2 sec.
10 ÷ 5 = 2
• If the flash count display is , the flash will
keep firing until the shutter speed ends or
until the maximum number of continuous
flashes (as indicated in the table on page
122) is fired.
Focus the subject.
• To set the exposure settings, see “Manual
Flash Mode” on page 44.
Check that the icon is displayed in
the viewfinder, then take the picture.
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3
4
To prevent overheating and deterioration of the flash head, do not use stroboscopic flash
for more than 10 frames in rapid succession. After 10 frames, allow the 550EX to cool for
at least 10 minutes.
• Stroboscopic flash is most effective with highly reflective subjects in front of a dark
background.
• Using a tripod and Remote Switch are recommended.
• Using an external power source is recommended for stroboscopic flash.
• Stroboscopic flash cannot be used at a flash output of 1/1 or 1/2.
• buLb can also be used with stroboscopic flash.
04. F073-E (31~) 02.4.1 2:10 PM Page 48