Now we see through a glass, darkly...
- Apr 5, 2016
Because in the same amount of time you're not able to move the lens as much or take as many frames in burst mode because you're waiting longer on AF between each frame. When shooting sports/action, your handling speed will affect how many total shots you wind up taking.So how does it extend battery life if the same amount of energy is required to focus the lens whether it happens quickly or more slowly? Either way the same amount of energy is expended to focus the lens.