  We continue our investigation of the optical properties of the solar
gravitational lens (SGL). We treat the Sun as an extended axisymmetric body and
model its gravitational field using zonal harmonics. We consider a point source
that is positioned at a large but finite distance from the Sun and, using our
new angular eikonal method, we established the electro-magnetic (EM) field on
the image plane in the focal region behind the SGL and derive the SGL's impulse
response in the form of its point-spread function (PSF). The expression that we
derive describes the extended Sun in all regions of interest, including the
regions of strong and weak interference and the region of geometric optics. The
result is in the form of a single integral with respect to the azimuthal angle
of the impact parameter, covering all lensing regimes of the SGL. The same
expression can be used to describe gravitational lensing by a compact
axisymmetric mass distribution, characterized by small deviations from
spherical symmetry. It is valid in all lensing regimes. We also derive results
that describe the intensity of light observed by an imaging telescope in the
focal region. We present results of numerical simulations showing the view by a
telescope that moves in the image plane toward the optical axis. We consider
imaging of both point and extended sources. We show that while point sources
yield a number of distinct images consistent with the caustics due to zonal
harmonics of a particular order (e.g., Einstein cross), extended sources always
result in the formation of an Einstein ring. These results represent the most
comprehensive wave-theoretical treatment of gravitational lensing in the weak
gravitational field of a compact axisymmetric gravitating object.
