Sekonic L-358 - Manual (Page 28)

-24-
5. The Brightness Difference mode can be canceled by pressing the Ave/ EV button r.
Reference:
To determine exposure after adjusting lights, turn both main and secondary light sources
on, raise the Lumisphere to the mark position, then take a reading along the camera
light axis.
This function can also be used for reflected light.
6. Advanced Functions