Left columns: Megacam R and I filter and VIDEO H filter images for the previously detected but unconfirmed candidate clusters at z ≥ 0.8, which are classified by increasing redshifts. The X-ray contours in green are logarithmically distributed in ten levels between the maximum and minimum emission observed in a 7 × 7 arcmin² box around the X-ray source, except for candidate 6 which displays 25 levels based on a 4 × 4 arcmin² box. Definitions of symbols are given in Fig. B.1. Middle columns: background subtracted and Gaussian filtered redshift distribution of the bright galaxies within the central arcmin for the corresponding candidates. Bottom columns: i − z (0.8 ≤ z <  1.2) or z − J (z ≥ 1.2) CMD plot of the galaxies above the VIDEO 5σ limit within 1 arcmin of the centre.