of the latest brown dwarfs known, $>$T8, later than spectrum used for up to date spectral classification scheme together with the 3 CFBDSIR ultracool dwarfs candidates. The regular T-dwarf approximate colour range is highlighted in the upper left corner. Note that given the strong dispersion in colours of T dwarfs, some mid/late T do spread out of this indicative colour range. \[zJJH\]](14277fg5.ps){width="8cm"}

After the March 2009 $J, H$, and $K_s$ follow-up observations, one candidate stood out as particularly interesting. We then obtained additional WIRCam $J, H$, and $K_s$ photometry for this object, CFBDSIR J145829+101343 (hereafter CFBDSIR1458). The resulting magnitudes are presented in Table \[mag\]. The SOFI photometry in this table has additional uncertainty because its calibration is bootstrapped from a small number of good 2MASS reference stars in the narrow field of the SOFI NTT images, especially so in the $H$ and $Ks$ bands.

CFBDSIR1458 colours are detailed in Table \[colours\] and shown in Fig. \[f\_chart\], and can be summarised as follows:

-   Very red far-red colours: $z'-J=$3.94, which Table \[colours\] compares to those of other ultracool brown dwarfs;

-   Very blue NIR colours, with \[$J-H$;$J-K_{\rm s}$\]=\[-0.46;-0.94\], pointing to very strong molecular absorptions in the $H$ and $K$ bands. The 