Sekonic Speedmaster L-858D-U Light Meter - Manual (Page 120)

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5. Measuring
NOTE
Two rules apply to the reference flash duration time.
t0.5 = Effective flash duration time
t0.1 = Total flash duration time
After flash firing, the time at which the maximum
intensity drops by half is called "t0.5". The time
at which the maximum intensity drops to 1/10 is
called "t0.1".
Generally, "t0.5" is called the flash duration time.
4.
Input the "Reference" of 0.1 to 0.9 by touching the numeric value.
The t value can be set in steps of 0.1 at a range of 0.1 to 0.9.
The first "0." is fixed. Input the first digit decimal only. (To set "0.1", input "1".)
Flash Duration Analysis
t Value Screen
The input
numeric value
is displayed.
[OK] Button [Cancel] Button
Flash Duration Analysis
t Value Screen
5.
Touch [OK] Button.
The setting is input, and the display returns to the Measuring Screen.
Touch the [Cancel] Button to return to the Measuring Screen without making the
modification.
Measuring Screen