1. Larger in scope. This project has gone far afield after our initial experiment didn't yield the data we were looking for.
2. Away from some place or thing. If you want to travel further afield, though, it'll be a very long walk.
Wide-ranging, at a distance, as in I started out identifying wild mushrooms, but since then I've gone far afield in other branches of botany . [c. 1400]