  The knowledge of the point spread function (PSF) of imaging instruments
represents a fundamental requirement for astronomical observations. The
Herschel PACS PSFs delivered by the instrument control centre are obtained from
observations of the Vesta asteroid, providing a characterisation of the central
part therefore excluding fainter features. However, in many cases information
on both the core and the wings of the PSFs is needed. With this aim, we combine
Vesta and Mars dedicated observations and obtain PACS PSFs with an
unprecedented dynamic range $(\sim 10^6)$, at slow and fast scan speeds and for
the three photometric bands.
