Sekonic Speedmaster L-858D-U Light Meter - Manual (Page 62)

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5. Measuring
5-1-1 T (shutter speed) Priority Mode
Displays aperture (F) for input ISO sensitivity and shutter speed values.
Operation
1.
Touch the Measuring Mode Icon on the Measuring Screen.
The Measuring Mode Screen is displayed.
2.
Touch the icon ( ) on the Measuring Mode Screen.
When it is selected, the display changes to the Measuring Screen.
Measuring Screen Measuring Screen
Measuring
Mode Icon
Measuring Mode Screen
3.
Set the light receiving method.
Switch to the Incident light, extended lumisphere ( )/retracted lumisphere ( ), or
reflected light. (  P32 , P37)