def fov(self):
        """
        Get the field of view in degrees.

        Returns
        -------------
        fov : (2,) float
          XY field of view in degrees
        """
        if self._fov is None:
            fov = [2.0 * np.degrees(np.arctan((px / 2.0) / f))
                   for px, f in zip(self._resolution, self._focal)]
            fov = np.asanyarray(fov, dtype=np.float64)
            self._fov = fov
        return self._fov
Get the field of view in degrees.

        Returns
        -------------
        fov : (2,) float
          XY field of view in degrees