  The Advanced Camera for Surveys is equipped with three prisms in the Solar
Blind (SBC) and High Resolution (HRC) Channels, which together cover the 1150 -
3500 A range, albeit at highly non-uniform spectral resolution. We present new
wavelength- and flux calibrations of the SBC (PR110L and PR130L) and HRC
(PR200L) prisms, based on calibration observations obtained in Cycle 13. The
calibration products are available to users via the ST-ECF/aXe web pages, and
can be used directly with the aXe package. We discuss our calibration strategy
and some caveats specific to slitless prism spectroscopy.
