As I understand it, focus priority delays the shot till focus is achieved, while release priority potentially takes a mis-focused shot.
Wikipedia says that release priority is usually used in continuous AF mode, and focus priority in single-shot AF mode.
Does the "usually" apply to the NEX-5R? When exactly (other than with manual focus) does this camera use release priority? The manual doesn't say, and Google doesn't find anything.
And how can I turn it off, in situations where I'd like to wait a fraction of a second rather than end up with a mis-focused shot?
If you don't know the answer regarding this specific model, you can give me a generic answer that applies to the NEX family, or a test that helps me figure this out by myself.