General "focus":
* Concentration: This is the most common and versatile translation. It means "concentration" or "focus" in general.
* Mise au point: This literally means "putting into point", and it can refer to focusing a camera lens or focusing on something mentally.
Focus as a noun:
* Le point focal: This literally means "the focal point", and it can refer to the center of attention or the subject of focus.
Focus as a verb:
* Se concentrer: This means "to concentrate" or "to focus" your attention on something.
* Mettre l'accent sur: This means "to emphasize" or "to focus on" a particular point.
The best translation will depend on the specific context of your sentence.