eagle vision with i phone 7

I don’t have an Eagle Vision but I do have a Side-Shot and use an iPhone 7 to video. All I do is to lock AE/AF when in iPhone video mode by touching the center of the screen for a few seconds while viewing the target. ‘AE/AF Lock’ will display at top of phone’s screen. You also can manually adjust the brightness using the slider to right of Yellow out-lined box when the autoadjust is locked.