Talk:Focus/@comment-98.234.61.120-20151206203719/@comment-91.153.107.214-20151206204700

A lens will only gain Focus XP when the item it's attached to gains affinity. You can have Several lenses, including different schools at the same time, and will gain XP towards each one, granted that you actually use the items equipped with a lens.

All progress is tracked, and the Focus trees all gain XP separately. You can change your primary school at any time, once you've unlocked the first skill for 50K Focus XP.