// find angleX & angleY
angleX = mouseX * lookSpeed;

angleY = mouseY * lookSpeed;
angleY = Mathf.Clamp(angleY, focusToMinY, focusToMaxY);

// rotate Focus around player
Player.Focus.RotateAround(Player.Pos, Player.Right, angleY);
Player.Focus.RotateAround(Player.Pos, Player.Up, angleX);