  The recent addition of the 28 m Cherenkov telescope (CT5) to the H.E.S.S.
array extended the experiment's sensitivity towards low energies. The lowest
energy threshold is obtained using monoscopic observations with CT5, providing
access to gamma-ray energies below 100 GeV. This is particularly beneficial for
studies of Active Galactic Nuclei (AGN) with soft spectra and located at
redshifts >= 0.5. Stereoscopic measurements with the full array (CT1-5) provide
a better background rejection than CT5 Mono, at a cost of a higher threshold.
We report on the analysis employing the CT5 data for AGN observations with a <
100 GeV threshold. In particular, the spectra of PKS 2155-304 and PG 1553+113
are presented.
