Sekonic Speedmaster L-858D-U Light Meter - Manual (Page 98)

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5. Measuring
4.
Touch the radio button of the Number of Pre-flash Button.
Set the number of pre-flash on the Number of Pre-flash Screen.
The display returns to the Measuring Screen.
If you do not change this number, touch the [Close] Button to return to the Measuring
Screen.
Number of Pre-flash Screen
[Close] Button
NOTE
The amount of pre-flashes fired by a flash unit can be different for different camera brands.
Check the camera manual for number fired by your camera system.