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Adami et al. (2010) have detected several cluster candidates at z>0.5 as partof a systematic search for clusters in the Canada France Hawaii TelescopeLegacy Survey, based on photometric redshifts. We focus here on two of them,located in the D3 field: D3-6 and D3-43. We have obtained spectroscopy withGemini/GMOS and measured redshifts for 23 and 14 galaxies in the twostructures. These redshifts were combined with those available in theliterature. A dynamical and a weak lensing analysis were also performed,together with the study of X-ray Chandra archive data. Cluster D3-6 is found tobe a single structure of 8 spectroscopically confirmed members at an averageredshift z=0.607, with a velocity dispersion of 423 km/s. It appears to be arelatively low mass cluster. D3-43-S3 has 46 spectroscopically confirmedmembers at an average redshift z=0.739. It can be decomposed into two mainsubstructures, having a velocity dispersion of about 600 and 350 km/s. Anexplanation to the fact that D3-43-S3 is detected through weak lensing (onlymarginally, at the ~3sigma level) but not in X-rays could be that the twosubstructures are just beginning to merge more or less along the line of sight.We also show that D3-6 and D3-43-S3 have similar global galaxy luminosityfunctions, stellar mass functions, and star formation rate (SFR) distributions.The only differences are that D3-6 exhibits a lack of faint early typegalaxies, a deficit of extremely high stellar mass galaxies compared toD3-43-S3, and an excess of very high SFR galaxies. This study shows the powerof techniques based on photometric redshifts to detect low to moderatelymassive structures, even at z~0.75.

Two spectroscopically confirmed galaxy structures at z=0.61 and 0.74 in the CFHTLS Deep~3 field