Focused Apertures are invaluable on Energy base weapons because they generally lack range. This special enables them to not only defend against attacks from all directions, but also endanger sniper fleets in some situations.
Focused Apertures are prohibitively expensive in terms of mass, forcing you to either use a lower-level weapon or sacrifice your Combat Module's durability. This is rarely worth it, which is the reason why Energy weapons are uncommon in bases.
Usually, only The Bridge can feasibly equip this special in addition to weapons, armor and shields.
The Focused Apertures was once called Lense Apertures.