"To focus" can be transitive or intransitive. You can focus your camera, and you can focus on your camera. When you use the transitive in active voice, it imphasizes your intention.
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lexi0077 "Be focused on A" sounds like "focus on A involuntarily."It can be exactly that, because "focused" in this case works as an adjective. There's no actor, as there could be with a finite verb, implied or otherwise.