(1/x)^zoomsensitivity seems to be the multiplier applied. x being 1.1, 1.2, or 1.5 depending on weapon. 0 = 1x. 2 = 1.21x, 1.44x, or 2.25x slower. For zoom fovs, it seems to subtract but it varies per weapon and not per weapon class. The unity pistol has a different zoom than the lexington for example. Quite disappointing overall.