How can I control EV in Manual Camera Controls? Function ▶ EV (Exposure value): Used to control brightness. 1. EV can be controlled in Unlock mode or when AE-L is turned off. 2. If AE-L button is turned ON (Lock mode), EV cannot be used. 3. As you go up (+ side), the screen gets brighter. When you go down (– side), the screen becomes darker. Note: When you adjust EV, ISO and SS are automatically controlled and their values are displayed on the top. 4. If ISO or SS is selected or AE-L is turned on while adjusting EV, EV cannot be changed. EV will be set up automatically according to ISO and SS settings.