Talk:Focus Lens/@comment-175.158.224.141-20161224201010/@comment-115.69.56.71-20161230081528

mastery points are gained when your equipment (weapons, frame, companions etc) level up, each and every level. Once an item hits lvl30 (for the first time) youve recieved all the mastery points that item can give you, and any further XP for that item is useless (ignoring shared XP).

Sticking a lens on the item turns a percentage of the surplus XP into focus points, and focus lenses cannot be equipped to an item that is yet to reach lvl30. Therefore lenses cannot interfere with an item's XP gain/mastery points, and vice versa if you forma an item with a lens equipped, said lens is disabled until the item reaches lvl30 again, allowing the item to level up normally.