Sony 4-183-746-11(1) - Manual (Page 48)

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Multiple flash (MULTI)
The flash is triggered a number of times while the shutter is open (multiple flash).
Multiple flash allows motion of the subject to be captured in a photograph for later
analysis.
• The camera must be set to the M mode for multiple flash photography.
1
Set the camera to the M mode.
2
Press the TTL/M button to display on the LCD
panel.