Bedeutung von “focus” im Essential American English Dictionary

focus

noun us /ˈfoʊ·kəs/
in focus

If a picture is in focus, it is clear:

Try to get your subject in focus.
out of focus

If a picture is out of focus, it is not clear:

The photos were all out of focus.

the person or thing that is getting most attention in a situation or activity:

He is the focus of a police investigation.

(Definition von “focus noun” aus dem Webster's Essential Mini Dictionary © Cambridge University Press)