i'm waiting for the original system camera app can lock on focus and exposure when taking photos and videos in the new version android.
it'd better to lock focus and exposure on each single way.
most times, for a good picture,photographers don't set the focus points at the same place as the auto exposure measuring, both in still photos and videos. Especially when taking a video, most photographers don't change the exposure in one shote,.People want to feel the shadows and the highlight area naturelly,they want to see the actors walking through the sunshine as a normal lightness and darkness as a silhouette in one shoot.