  We present a gravitational lensing study of the massive galaxy cluster A2219
(redshift 0.22). This investigation is based on multicolour images from U
through H, which allows photometric redshifts to be estimated for the
background sources. The redshifts provide useful extra information for the
lensing models: we show how they can be used to identify a new multiple-image
system (and rule out an old one), how this information can be used to anchor
the mass model for the cluster, and how the redshifts can be used to construct
optimal samples of background galaxies for a weak lensing analysis. Combining
all results, we obtain the mass distribution in this cluster from the inner,
strong lensing region, out to a radius of 1.5 Mpc. The mass profile is
consistent with a singular isothermal model over this radius range. Parametric
and non-parametric reconstructions of the mass distribution in the cluster are
compared. The main features (elongation, sub-clumps, radial mass profile) are
in good agreement.
