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We present Hubble Space Telescope (HST) imaging data and CFHT Near IRground-based images for the final sample of 56 candidate galaxy-scale lensesuncovered in the CFHT Legacy Survey as part of the Strong Lensing in the LegacySurvey (SL2S) project. The new images are used to perform lens modeling,measure surface photometry, and estimate stellar masses of the deflectorearly-type galaxies. Lens modeling is performed on the HST images (or CFHT whenHST is not available) by fitting the spatially extended light distribution ofthe lensed features assuming a singular isothermal ellipsoid mass profile andby reconstructing the intrinsic source light distribution on a pixelized grid.Based on the analysis of systematic uncertainties and comparison with inferencebased on different methods we estimate that our Einstein Radii are accurate to\sim3%. HST imaging provides a much higher success rate in confirminggravitational lenses and measuring their Einstein radii than CFHT imaging does.Lens modeling with ground-based images however, when successful, yieldsEinstein radius measurements that are competitive with spaced-based images.Information from the lens models is used together with spectroscopicinformation from the companion paper IV to classify the systems, resulting in afinal sample of 39 confirmed (grade-A) lenses and 17 promising candidates. Theredshifts of the main deflector span a range 0.3<zd< 0.8, providing anexcellent sample for the study of the cosmic evolution of the mass distributionof early-type galaxies over the second half of the history of the Universe.

The SL2S Galaxy-scale Lens Sample. III. Lens Models, Surface Photometry and Stellar Masses for the final sample