Sekonic Speedmaster L-858D-U Light Meter - Manual (Page 194)

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6. Functions
12) Color Theme Setting
Set the color theme of the Measuring Screen.
You can select the screen background color from black, white, rose, and blue.
Black (Default) White Rose Blue
NOTICE
The viewfinder background color in the reflected light system cannot be changed.
Operation
1.
Touch the [Color Theme] Button on page 3 of the Custom Setting
Menu Screen.
The Color Theme Screen is displayed.
2.
Touch the desired item.
Touch the desired radio button or an area around the item name to select.