Yeah I've been reading up on the exposure lock, seems really good and I'm going to start using it. I at least always use focus on the subject of the picture, and did so in that picture.
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From what I understand the iphone calculates which will look better, the telephoto lens or a digital zoom, so you have to trust the iphone. If you do catch it digitally zooming what do you do? Do you trust that the iphone's algorithms know better than you, or trust that manually you can get better results? Much of these shortcomings do not become apparent until after you take the picture. And if I do catch the digital zoom being on, then I'm back to the same situation I was in originally.
No Focus lock isn’t the same as focusing on the subject.
If you only use focus on a moving subject it will be horrible.
When your taking a picture Just tap and hold on the image of your subject. Until your get the focus and exposure lock
This is what it looks like when it’s on.

It’s super easy, if you use that with burst mode it should improve any photos significantly, including fast moving subjects.
So you know how to imitate burst mode on the iPhone?