Sony NW-A306 Walkman A Series High-Resolution Digital Audio Player (Black) - Manual (Page 230)

Hint
This can also be set using [Shooting] > [ISO/Gain/EI] > [Exposure Index] in the camera menu.
SDI output can be used in the same way.
The second numerical value of the setting indicates how many steps of brightness information are assigned for bright areas
(brightness higher than 18% gray). Areas brighter than these are overexposed.
Example: In “400EI/5.0E,” 5.0 steps are assigned on the bright side.
You can also use this as a guide to check the tone of dark and bright areas during shooting. Remember to return to the original EI
value after checking the exposure.
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