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We present mass reconstructions from weak lensing for the galaxy clustersA1835 and A2204 over 34'x34' fields using data from the ESO/MPG Wide FieldImager. Using a background galaxy population of 22<R<25.5 we detect thegravitational shear of A1835 at 8.8 sigma significance, and obtain best-fitmass profiles of sigma_v=1233^{+66}_{-70} km/s for a singular isothermal spheremodel and r_{200}=1550 h^{-1} kpc, c=2.96 for a `universal' CDM profile. Usinga color-selected background galaxy population of 22<R<25.8 we detect thegravitational shear of A2204 at 7.2 sigma significance, and obtain best-fitmass profiles of sigma_v=1035^{+65}_{-71} km/s for a SIS model and r_{200}=1310h^{-1} km/s, c=6.3 for a `universal' CDM profile. The gravitational shear atdistances greater than 10' is significantly detected for both clusters. Thebest fit weak lensing cluster masses agree well with both X-ray and dynamicalmass measurements, although the central concentration of A1835 is much lower inthe weak lensing mass profile than that measured by recent Chandra results. Wesuggest that this lower concentration is most likely a combination ofcontamination of the 'background' galaxy population with cluster dwarf galaxiesand the effect of a prolate or tri-axial cluster core with the major axis lyingnear the plane of the sky. We also detect a number of additional structures atmoderate significance, some of which appear to be sub-haloes associated withthe clusters.

Wide field weak lensing observations of A1835 and A2204